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Finding the Fourth Proportional to 157,439.76, 217,269.13 and 85,819.78

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Solution

The fourth proportional to 157,439.76, 217,269.13 and 85,819.78 is: 118,432.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,439.76 : 217,269.13 = 85,819.78 : x
  2. Step 2: Convert to fraction form
    157,439.76/217,269.13 = 85,819.78/x
  3. Step 3: Cross multiply
    157,439.76x = 217,269.13 × 85,819.78
  4. Step 4: Simplify right side
    157,439.76x = 18,645,988,937.39
  5. Step 5: Solve for x
    x = 18,645,988,937.39/157,439.76
  6. Step 6: Final answer
    x = 118,432.53

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1.5x scale

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.