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Finding the Fourth Proportional to 429,511.20, 644,102.78 and 129,892.20

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Solution

The fourth proportional to 429,511.20, 644,102.78 and 129,892.20 is: 194,788.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,511.20 : 644,102.78 = 129,892.20 : x
  2. Step 2: Convert to fraction form
    429,511.20/644,102.78 = 129,892.20/x
  3. Step 3: Cross multiply
    429,511.20x = 644,102.78 × 129,892.20
  4. Step 4: Simplify right side
    429,511.20x = 83,663,926,470.86
  5. Step 5: Solve for x
    x = 83,663,926,470.86/429,511.20
  6. Step 6: Final answer
    x = 194,788.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.