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Finding the Fourth Proportional to 167.79, 231.20 and 128.91

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Solution

The fourth proportional to 167.79, 231.20 and 128.91 is: 177.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.79 : 231.20 = 128.91 : x
  2. Step 2: Convert to fraction form
    167.79/231.20 = 128.91/x
  3. Step 3: Cross multiply
    167.79x = 231.20 × 128.91
  4. Step 4: Simplify right side
    167.79x = 29,803.35
  5. Step 5: Solve for x
    x = 29,803.35/167.79
  6. Step 6: Final answer
    x = 177.62

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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.