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Finding the Fourth Proportional to 112.42, 168.75 and 89.86

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Solution

The fourth proportional to 112.42, 168.75 and 89.86 is: 134.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.42 : 168.75 = 89.86 : x
  2. Step 2: Convert to fraction form
    112.42/168.75 = 89.86/x
  3. Step 3: Cross multiply
    112.42x = 168.75 × 89.86
  4. Step 4: Simplify right side
    112.42x = 15,163.88
  5. Step 5: Solve for x
    x = 15,163.88/112.42
  6. Step 6: Final answer
    x = 134.89

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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.