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Finding the Fourth Proportional to 112.20, 168.06 and 87.90

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Solution

The fourth proportional to 112.20, 168.06 and 87.90 is: 131.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.20 : 168.06 = 87.90 : x
  2. Step 2: Convert to fraction form
    112.20/168.06 = 87.90/x
  3. Step 3: Cross multiply
    112.20x = 168.06 × 87.90
  4. Step 4: Simplify right side
    112.20x = 14,772.47
  5. Step 5: Solve for x
    x = 14,772.47/112.20
  6. Step 6: Final answer
    x = 131.66

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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.