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Finding the Fourth Proportional to 92.39, 138.74 and 86.24

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Solution

The fourth proportional to 92.39, 138.74 and 86.24 is: 129.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.39 : 138.74 = 86.24 : x
  2. Step 2: Convert to fraction form
    92.39/138.74 = 86.24/x
  3. Step 3: Cross multiply
    92.39x = 138.74 × 86.24
  4. Step 4: Simplify right side
    92.39x = 11,963.81
  5. Step 5: Solve for x
    x = 11,963.81/92.39
  6. Step 6: Final answer
    x = 129.50

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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.