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Finding the Fourth Proportional to 639,397,323.90, 959,095,985.85 and 639,397,323.90

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Solution

The fourth proportional to 639,397,323.90, 959,095,985.85 and 639,397,323.90 is: 959,095,985.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,397,323.90 : 959,095,985.85 = 639,397,323.90 : x
  2. Step 2: Convert to fraction form
    639,397,323.90/959,095,985.85 = 639,397,323.90/x
  3. Step 3: Cross multiply
    639,397,323.90x = 959,095,985.85 × 639,397,323.90
  4. Step 4: Simplify right side
    639,397,323.90x = 613,243,406,715,722,240
  5. Step 5: Solve for x
    x = 613,243,406,715,722,240/639,397,323.90
  6. Step 6: Final answer
    x = 959,095,985.85

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.