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Finding the Fourth Proportional to 167.80, 231.75 and 112.79

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Solution

The fourth proportional to 167.80, 231.75 and 112.79 is: 155.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.80 : 231.75 = 112.79 : x
  2. Step 2: Convert to fraction form
    167.80/231.75 = 112.79/x
  3. Step 3: Cross multiply
    167.80x = 231.75 × 112.79
  4. Step 4: Simplify right side
    167.80x = 26,139.08
  5. Step 5: Solve for x
    x = 26,139.08/167.80
  6. Step 6: Final answer
    x = 155.78

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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.