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Finding the Fourth Proportional to 92.63, 138.61 and 87.42

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Solution

The fourth proportional to 92.63, 138.61 and 87.42 is: 130.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.63 : 138.61 = 87.42 : x
  2. Step 2: Convert to fraction form
    92.63/138.61 = 87.42/x
  3. Step 3: Cross multiply
    92.63x = 138.61 × 87.42
  4. Step 4: Simplify right side
    92.63x = 12,117.07
  5. Step 5: Solve for x
    x = 12,117.07/92.63
  6. Step 6: Final answer
    x = 130.82

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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.