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Finding the Fourth Proportional to 167.50, 231.47 and 128.13

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Solution

The fourth proportional to 167.50, 231.47 and 128.13 is: 177.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.50 : 231.47 = 128.13 : x
  2. Step 2: Convert to fraction form
    167.50/231.47 = 128.13/x
  3. Step 3: Cross multiply
    167.50x = 231.47 × 128.13
  4. Step 4: Simplify right side
    167.50x = 29,658.25
  5. Step 5: Solve for x
    x = 29,658.25/167.50
  6. Step 6: Final answer
    x = 177.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.