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Finding the Fourth Proportional to 92,140.64, 138,279.28 and 68,502.88

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Solution

The fourth proportional to 92,140.64, 138,279.28 and 68,502.88 is: 102,805.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,140.64 : 138,279.28 = 68,502.88 : x
  2. Step 2: Convert to fraction form
    92,140.64/138,279.28 = 68,502.88/x
  3. Step 3: Cross multiply
    92,140.64x = 138,279.28 × 68,502.88
  4. Step 4: Simplify right side
    92,140.64x = 9,472,528,924.33
  5. Step 5: Solve for x
    x = 9,472,528,924.33/92,140.64
  6. Step 6: Final answer
    x = 102,805.11

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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.