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Finding the Fourth Proportional to 167.90, 231.71 and 105.70

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Solution

The fourth proportional to 167.90, 231.71 and 105.70 is: 145.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.90 : 231.71 = 105.70 : x
  2. Step 2: Convert to fraction form
    167.90/231.71 = 105.70/x
  3. Step 3: Cross multiply
    167.90x = 231.71 × 105.70
  4. Step 4: Simplify right side
    167.90x = 24,491.75
  5. Step 5: Solve for x
    x = 24,491.75/167.90
  6. Step 6: Final answer
    x = 145.87

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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.