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Finding the Fourth Proportional to 91.62, 137.32 and 86.23

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Solution

The fourth proportional to 91.62, 137.32 and 86.23 is: 129.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.62 : 137.32 = 86.23 : x
  2. Step 2: Convert to fraction form
    91.62/137.32 = 86.23/x
  3. Step 3: Cross multiply
    91.62x = 137.32 × 86.23
  4. Step 4: Simplify right side
    91.62x = 11,841.10
  5. Step 5: Solve for x
    x = 11,841.10/91.62
  6. Step 6: Final answer
    x = 129.24

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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.