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Finding the Fourth Proportional to 113.11, 169.71 and 87.42

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Solution

The fourth proportional to 113.11, 169.71 and 87.42 is: 131.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.11 : 169.71 = 87.42 : x
  2. Step 2: Convert to fraction form
    113.11/169.71 = 87.42/x
  3. Step 3: Cross multiply
    113.11x = 169.71 × 87.42
  4. Step 4: Simplify right side
    113.11x = 14,836.05
  5. Step 5: Solve for x
    x = 14,836.05/113.11
  6. Step 6: Final answer
    x = 131.17

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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.