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Finding the Fourth Proportional to 111.77, 167.41 and 85.90

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Solution

The fourth proportional to 111.77, 167.41 and 85.90 is: 128.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.77 : 167.41 = 85.90 : x
  2. Step 2: Convert to fraction form
    111.77/167.41 = 85.90/x
  3. Step 3: Cross multiply
    111.77x = 167.41 × 85.90
  4. Step 4: Simplify right side
    111.77x = 14,381.15
  5. Step 5: Solve for x
    x = 14,381.15/111.77
  6. Step 6: Final answer
    x = 128.66

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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.