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Finding the Fourth Proportional to 663,037.65, 915,101.69 and 391,172.09

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Solution

The fourth proportional to 663,037.65, 915,101.69 and 391,172.09 is: 539,882.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,037.65 : 915,101.69 = 391,172.09 : x
  2. Step 2: Convert to fraction form
    663,037.65/915,101.69 = 391,172.09/x
  3. Step 3: Cross multiply
    663,037.65x = 915,101.69 × 391,172.09
  4. Step 4: Simplify right side
    663,037.65x = 357,962,234,108.46
  5. Step 5: Solve for x
    x = 357,962,234,108.46/663,037.65
  6. Step 6: Final answer
    x = 539,882.21

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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.