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Finding the Fourth Proportional to 92.64, 138.96 and 86.52

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Solution

The fourth proportional to 92.64, 138.96 and 86.52 is: 129.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.64 : 138.96 = 86.52 : x
  2. Step 2: Convert to fraction form
    92.64/138.96 = 86.52/x
  3. Step 3: Cross multiply
    92.64x = 138.96 × 86.52
  4. Step 4: Simplify right side
    92.64x = 12,022.82
  5. Step 5: Solve for x
    x = 12,022.82/92.64
  6. Step 6: Final answer
    x = 129.78

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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.