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Finding the Fourth Proportional to 167.31, 250.65 and 85.95

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Solution

The fourth proportional to 167.31, 250.65 and 85.95 is: 128.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.31 : 250.65 = 85.95 : x
  2. Step 2: Convert to fraction form
    167.31/250.65 = 85.95/x
  3. Step 3: Cross multiply
    167.31x = 250.65 × 85.95
  4. Step 4: Simplify right side
    167.31x = 21,543.37
  5. Step 5: Solve for x
    x = 21,543.37/167.31
  6. Step 6: Final answer
    x = 128.76

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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.