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Finding the Fourth Proportional to 138,613.92, 191,287.36 and 74,951.76

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Solution

The fourth proportional to 138,613.92, 191,287.36 and 74,951.76 is: 103,433.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,613.92 : 191,287.36 = 74,951.76 : x
  2. Step 2: Convert to fraction form
    138,613.92/191,287.36 = 74,951.76/x
  3. Step 3: Cross multiply
    138,613.92x = 191,287.36 × 74,951.76
  4. Step 4: Simplify right side
    138,613.92x = 14,337,324,297.75
  5. Step 5: Solve for x
    x = 14,337,324,297.75/138,613.92
  6. Step 6: Final answer
    x = 103,433.51

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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.