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Finding the Fourth Proportional to 391.04, 539.72 and 225.29

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Solution

The fourth proportional to 391.04, 539.72 and 225.29 is: 310.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.04 : 539.72 = 225.29 : x
  2. Step 2: Convert to fraction form
    391.04/539.72 = 225.29/x
  3. Step 3: Cross multiply
    391.04x = 539.72 × 225.29
  4. Step 4: Simplify right side
    391.04x = 121,593.52
  5. Step 5: Solve for x
    x = 121,593.52/391.04
  6. Step 6: Final answer
    x = 310.95

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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.