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Finding the Fourth Proportional to 113.60, 169.73 and 87.42

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Solution

The fourth proportional to 113.60, 169.73 and 87.42 is: 130.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.60 : 169.73 = 87.42 : x
  2. Step 2: Convert to fraction form
    113.60/169.73 = 87.42/x
  3. Step 3: Cross multiply
    113.60x = 169.73 × 87.42
  4. Step 4: Simplify right side
    113.60x = 14,837.80
  5. Step 5: Solve for x
    x = 14,837.80/113.60
  6. Step 6: Final answer
    x = 130.61

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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.