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Finding the Fourth Proportional to 639,393,945.40, 959,090,918.10 and 639,393,945.40

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Solution

The fourth proportional to 639,393,945.40, 959,090,918.10 and 639,393,945.40 is: 959,090,918.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,393,945.40 : 959,090,918.10 = 639,393,945.40 : x
  2. Step 2: Convert to fraction form
    639,393,945.40/959,090,918.10 = 639,393,945.40/x
  3. Step 3: Cross multiply
    639,393,945.40x = 959,090,918.10 × 639,393,945.40
  4. Step 4: Simplify right side
    639,393,945.40x = 613,236,926,121,267,328
  5. Step 5: Solve for x
    x = 613,236,926,121,267,328/639,393,945.40
  6. Step 6: Final answer
    x = 959,090,918.10

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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.