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Finding the Fourth Proportional to 111.75, 167.37 and 77.36

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Solution

The fourth proportional to 111.75, 167.37 and 77.36 is: 115.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.75 : 167.37 = 77.36 : x
  2. Step 2: Convert to fraction form
    111.75/167.37 = 77.36/x
  3. Step 3: Cross multiply
    111.75x = 167.37 × 77.36
  4. Step 4: Simplify right side
    111.75x = 12,946.91
  5. Step 5: Solve for x
    x = 12,946.91/111.75
  6. Step 6: Final answer
    x = 115.86

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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.