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Finding the Fourth Proportional to 708,852,160.44, 978,231,640.55 and 391,311,654.27

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Solution

The fourth proportional to 708,852,160.44, 978,231,640.55 and 391,311,654.27 is: 540,018,727.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,852,160.44 : 978,231,640.55 = 391,311,654.27 : x
  2. Step 2: Convert to fraction form
    708,852,160.44/978,231,640.55 = 391,311,654.27/x
  3. Step 3: Cross multiply
    708,852,160.44x = 978,231,640.55 × 391,311,654.27
  4. Step 4: Simplify right side
    708,852,160.44x = 382,793,441,522,876,480
  5. Step 5: Solve for x
    x = 382,793,441,522,876,480/708,852,160.44
  6. Step 6: Final answer
    x = 540,018,727.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.