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Finding the Fourth Proportional to 100.92, 138.96 and 86.14

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Solution

The fourth proportional to 100.92, 138.96 and 86.14 is: 118.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.92 : 138.96 = 86.14 : x
  2. Step 2: Convert to fraction form
    100.92/138.96 = 86.14/x
  3. Step 3: Cross multiply
    100.92x = 138.96 × 86.14
  4. Step 4: Simplify right side
    100.92x = 11,970.01
  5. Step 5: Solve for x
    x = 11,970.01/100.92
  6. Step 6: Final answer
    x = 118.61

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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.