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Finding the Fourth Proportional to 112.91, 169.49 and 87.54

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Solution

The fourth proportional to 112.91, 169.49 and 87.54 is: 131.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.91 : 169.49 = 87.54 : x
  2. Step 2: Convert to fraction form
    112.91/169.49 = 87.54/x
  3. Step 3: Cross multiply
    112.91x = 169.49 × 87.54
  4. Step 4: Simplify right side
    112.91x = 14,837.37
  5. Step 5: Solve for x
    x = 14,837.37/112.91
  6. Step 6: Final answer
    x = 131.41

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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.