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Finding the Fourth Proportional to 663,784.20, 915,786 and 391,715.96

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Solution

The fourth proportional to 663,784.20, 915,786 and 391,715.96 is: 540,428.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,784.20 : 915,786 = 391,715.96 : x
  2. Step 2: Convert to fraction form
    663,784.20/915,786 = 391,715.96/x
  3. Step 3: Cross multiply
    663,784.20x = 915,786 × 391,715.96
  4. Step 4: Simplify right side
    663,784.20x = 358,727,987,565.63
  5. Step 5: Solve for x
    x = 358,727,987,565.63/663,784.20
  6. Step 6: Final answer
    x = 540,428.63

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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.