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Finding the Fourth Proportional to 111.58, 167.40 and 85.86

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Solution

The fourth proportional to 111.58, 167.40 and 85.86 is: 128.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.58 : 167.40 = 85.86 : x
  2. Step 2: Convert to fraction form
    111.58/167.40 = 85.86/x
  3. Step 3: Cross multiply
    111.58x = 167.40 × 85.86
  4. Step 4: Simplify right side
    111.58x = 14,372.96
  5. Step 5: Solve for x
    x = 14,372.96/111.58
  6. Step 6: Final answer
    x = 128.82

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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.