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Finding the Fourth Proportional to 112.58, 168.89 and 76.16

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Solution

The fourth proportional to 112.58, 168.89 and 76.16 is: 114.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.58 : 168.89 = 76.16 : x
  2. Step 2: Convert to fraction form
    112.58/168.89 = 76.16/x
  3. Step 3: Cross multiply
    112.58x = 168.89 × 76.16
  4. Step 4: Simplify right side
    112.58x = 12,861.44
  5. Step 5: Solve for x
    x = 12,861.44/112.58
  6. Step 6: Final answer
    x = 114.25

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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.