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Finding the Fourth Proportional to 113.92, 171.26 and 90.16

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Solution

The fourth proportional to 113.92, 171.26 and 90.16 is: 135.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.92 : 171.26 = 90.16 : x
  2. Step 2: Convert to fraction form
    113.92/171.26 = 90.16/x
  3. Step 3: Cross multiply
    113.92x = 171.26 × 90.16
  4. Step 4: Simplify right side
    113.92x = 15,440.80
  5. Step 5: Solve for x
    x = 15,440.80/113.92
  6. Step 6: Final answer
    x = 135.54

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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.