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Finding the Fourth Proportional to 639,397,638.80, 959,096,458.20 and 639,397,638.80

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Solution

The fourth proportional to 639,397,638.80, 959,096,458.20 and 639,397,638.80 is: 959,096,458.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,397,638.80 : 959,096,458.20 = 639,397,638.80 : x
  2. Step 2: Convert to fraction form
    639,397,638.80/959,096,458.20 = 639,397,638.80/x
  3. Step 3: Cross multiply
    639,397,638.80x = 959,096,458.20 × 639,397,638.80
  4. Step 4: Simplify right side
    639,397,638.80x = 613,244,010,754,522,880
  5. Step 5: Solve for x
    x = 613,244,010,754,522,880/639,397,638.80
  6. Step 6: Final answer
    x = 959,096,458.20

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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.