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Finding the Fourth Proportional to 663,624.96, 915,776.07 and 391,780.44

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Solution

The fourth proportional to 663,624.96, 915,776.07 and 391,780.44 is: 540,641.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,624.96 : 915,776.07 = 391,780.44 : x
  2. Step 2: Convert to fraction form
    663,624.96/915,776.07 = 391,780.44/x
  3. Step 3: Cross multiply
    663,624.96x = 915,776.07 × 391,780.44
  4. Step 4: Simplify right side
    663,624.96x = 358,783,151,646.07
  5. Step 5: Solve for x
    x = 358,783,151,646.07/663,624.96
  6. Step 6: Final answer
    x = 540,641.44

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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.