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Finding the Fourth Proportional to 113.64, 169.80 and 86.52

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Solution

The fourth proportional to 113.64, 169.80 and 86.52 is: 129.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.64 : 169.80 = 86.52 : x
  2. Step 2: Convert to fraction form
    113.64/169.80 = 86.52/x
  3. Step 3: Cross multiply
    113.64x = 169.80 × 86.52
  4. Step 4: Simplify right side
    113.64x = 14,691.10
  5. Step 5: Solve for x
    x = 14,691.10/113.64
  6. Step 6: Final answer
    x = 129.28

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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.