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Finding the Fourth Proportional to 111.76, 167.36 and 86

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Solution

The fourth proportional to 111.76, 167.36 and 86 is: 128.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.76 : 167.36 = 86 : x
  2. Step 2: Convert to fraction form
    111.76/167.36 = 86/x
  3. Step 3: Cross multiply
    111.76x = 167.36 × 86
  4. Step 4: Simplify right side
    111.76x = 14,392.96
  5. Step 5: Solve for x
    x = 14,392.96/111.76
  6. Step 6: Final answer
    x = 128.78

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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.