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Finding the Fourth Proportional to 113.75, 170.21 and 87.92

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Solution

The fourth proportional to 113.75, 170.21 and 87.92 is: 131.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.75 : 170.21 = 87.92 : x
  2. Step 2: Convert to fraction form
    113.75/170.21 = 87.92/x
  3. Step 3: Cross multiply
    113.75x = 170.21 × 87.92
  4. Step 4: Simplify right side
    113.75x = 14,964.86
  5. Step 5: Solve for x
    x = 14,964.86/113.75
  6. Step 6: Final answer
    x = 131.56

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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.