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Finding the Fourth Proportional to 167.34, 250.99 and 86.21

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Solution

The fourth proportional to 167.34, 250.99 and 86.21 is: 129.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.34 : 250.99 = 86.21 : x
  2. Step 2: Convert to fraction form
    167.34/250.99 = 86.21/x
  3. Step 3: Cross multiply
    167.34x = 250.99 × 86.21
  4. Step 4: Simplify right side
    167.34x = 21,637.85
  5. Step 5: Solve for x
    x = 21,637.85/167.34
  6. Step 6: Final answer
    x = 129.30

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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.