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Finding the Fourth Proportional to 138,613.64, 191,286.90 and 74,951.96

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Solution

The fourth proportional to 138,613.64, 191,286.90 and 74,951.96 is: 103,433.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,613.64 : 191,286.90 = 74,951.96 : x
  2. Step 2: Convert to fraction form
    138,613.64/191,286.90 = 74,951.96/x
  3. Step 3: Cross multiply
    138,613.64x = 191,286.90 × 74,951.96
  4. Step 4: Simplify right side
    138,613.64x = 14,337,328,077.32
  5. Step 5: Solve for x
    x = 14,337,328,077.32/138,613.64
  6. Step 6: Final answer
    x = 103,433.75

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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.