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Finding the Fourth Proportional to 112.56, 168.60 and 86.82

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Solution

The fourth proportional to 112.56, 168.60 and 86.82 is: 130.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.56 : 168.60 = 86.82 : x
  2. Step 2: Convert to fraction form
    112.56/168.60 = 86.82/x
  3. Step 3: Cross multiply
    112.56x = 168.60 × 86.82
  4. Step 4: Simplify right side
    112.56x = 14,637.85
  5. Step 5: Solve for x
    x = 14,637.85/112.56
  6. Step 6: Final answer
    x = 130.04

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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.