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Finding the Fourth Proportional to 113.31, 169.59 and 87.54

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Solution

The fourth proportional to 113.31, 169.59 and 87.54 is: 131.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.31 : 169.59 = 87.54 : x
  2. Step 2: Convert to fraction form
    113.31/169.59 = 87.54/x
  3. Step 3: Cross multiply
    113.31x = 169.59 × 87.54
  4. Step 4: Simplify right side
    113.31x = 14,845.91
  5. Step 5: Solve for x
    x = 14,845.91/113.31
  6. Step 6: Final answer
    x = 131.02

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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.