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Finding the Fourth Proportional to 391.67, 587.24 and 172.29

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Solution

The fourth proportional to 391.67, 587.24 and 172.29 is: 258.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.67 : 587.24 = 172.29 : x
  2. Step 2: Convert to fraction form
    391.67/587.24 = 172.29/x
  3. Step 3: Cross multiply
    391.67x = 587.24 × 172.29
  4. Step 4: Simplify right side
    391.67x = 101,177.57
  5. Step 5: Solve for x
    x = 101,177.57/391.67
  6. Step 6: Final answer
    x = 258.32

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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.