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Finding the Fourth Proportional to 138,864.66, 191,636.73 and 85,179.29

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Solution

The fourth proportional to 138,864.66, 191,636.73 and 85,179.29 is: 117,549.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,864.66 : 191,636.73 = 85,179.29 : x
  2. Step 2: Convert to fraction form
    138,864.66/191,636.73 = 85,179.29/x
  3. Step 3: Cross multiply
    138,864.66x = 191,636.73 × 85,179.29
  4. Step 4: Simplify right side
    138,864.66x = 16,323,479,641.14
  5. Step 5: Solve for x
    x = 16,323,479,641.14/138,864.66
  6. Step 6: Final answer
    x = 117,549.56

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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.