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Finding the Fourth Proportional to 92.32, 137.87 and 81.52

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Solution

The fourth proportional to 92.32, 137.87 and 81.52 is: 121.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.32 : 137.87 = 81.52 : x
  2. Step 2: Convert to fraction form
    92.32/137.87 = 81.52/x
  3. Step 3: Cross multiply
    92.32x = 137.87 × 81.52
  4. Step 4: Simplify right side
    92.32x = 11,238.75
  5. Step 5: Solve for x
    x = 11,238.75/92.32
  6. Step 6: Final answer
    x = 121.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.