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Finding the Fourth Proportional to 110.12, 151.92 and 86.78

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Solution

The fourth proportional to 110.12, 151.92 and 86.78 is: 119.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.12 : 151.92 = 86.78 : x
  2. Step 2: Convert to fraction form
    110.12/151.92 = 86.78/x
  3. Step 3: Cross multiply
    110.12x = 151.92 × 86.78
  4. Step 4: Simplify right side
    110.12x = 13,182.86
  5. Step 5: Solve for x
    x = 13,182.86/110.12
  6. Step 6: Final answer
    x = 119.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.