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Finding the Fourth Proportional to 345,398.76, 517,949.91 and 120,691.80

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Solution

The fourth proportional to 345,398.76, 517,949.91 and 120,691.80 is: 180,985.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    345,398.76 : 517,949.91 = 120,691.80 : x
  2. Step 2: Convert to fraction form
    345,398.76/517,949.91 = 120,691.80/x
  3. Step 3: Cross multiply
    345,398.76x = 517,949.91 × 120,691.80
  4. Step 4: Simplify right side
    345,398.76x = 62,512,306,947.74
  5. Step 5: Solve for x
    x = 62,512,306,947.74/345,398.76
  6. Step 6: Final answer
    x = 180,985.90

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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.