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Finding the Fourth Proportional to 709,479,944.28, 978,940,308.78 and 396,165,950.28

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Solution

The fourth proportional to 709,479,944.28, 978,940,308.78 and 396,165,950.28 is: 546,629,712.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,479,944.28 : 978,940,308.78 = 396,165,950.28 : x
  2. Step 2: Convert to fraction form
    709,479,944.28/978,940,308.78 = 396,165,950.28/x
  3. Step 3: Cross multiply
    709,479,944.28x = 978,940,308.78 × 396,165,950.28
  4. Step 4: Simplify right side
    709,479,944.28x = 387,822,817,695,225,280
  5. Step 5: Solve for x
    x = 387,822,817,695,225,280/709,479,944.28
  6. Step 6: Final answer
    x = 546,629,712.12

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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.