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Finding the Fourth Proportional to 391.31, 586.17 and 226.30

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Solution

The fourth proportional to 391.31, 586.17 and 226.30 is: 338.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.31 : 586.17 = 226.30 : x
  2. Step 2: Convert to fraction form
    391.31/586.17 = 226.30/x
  3. Step 3: Cross multiply
    391.31x = 586.17 × 226.30
  4. Step 4: Simplify right side
    391.31x = 132,648.81
  5. Step 5: Solve for x
    x = 132,648.81/391.31
  6. Step 6: Final answer
    x = 338.99

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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.