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Finding the Fourth Proportional to 92.52, 137.79 and 87

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Solution

The fourth proportional to 92.52, 137.79 and 87 is: 129.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.52 : 137.79 = 87 : x
  2. Step 2: Convert to fraction form
    92.52/137.79 = 87/x
  3. Step 3: Cross multiply
    92.52x = 137.79 × 87
  4. Step 4: Simplify right side
    92.52x = 11,987.73
  5. Step 5: Solve for x
    x = 11,987.73/92.52
  6. Step 6: Final answer
    x = 129.57

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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.