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Finding the Fourth Proportional to 167.20, 250.66 and 86

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Solution

The fourth proportional to 167.20, 250.66 and 86 is: 128.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.20 : 250.66 = 86 : x
  2. Step 2: Convert to fraction form
    167.20/250.66 = 86/x
  3. Step 3: Cross multiply
    167.20x = 250.66 × 86
  4. Step 4: Simplify right side
    167.20x = 21,556.76
  5. Step 5: Solve for x
    x = 21,556.76/167.20
  6. Step 6: Final answer
    x = 128.93

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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.