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Finding the Fourth Proportional to 92.49, 138.54 and 86.16

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Solution

The fourth proportional to 92.49, 138.54 and 86.16 is: 129.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.49 : 138.54 = 86.16 : x
  2. Step 2: Convert to fraction form
    92.49/138.54 = 86.16/x
  3. Step 3: Cross multiply
    92.49x = 138.54 × 86.16
  4. Step 4: Simplify right side
    92.49x = 11,936.61
  5. Step 5: Solve for x
    x = 11,936.61/92.49
  6. Step 6: Final answer
    x = 129.06

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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.