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Finding the Fourth Proportional to 539.14, 743.89 and 391.52

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Solution

The fourth proportional to 539.14, 743.89 and 391.52 is: 540.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.14 : 743.89 = 391.52 : x
  2. Step 2: Convert to fraction form
    539.14/743.89 = 391.52/x
  3. Step 3: Cross multiply
    539.14x = 743.89 × 391.52
  4. Step 4: Simplify right side
    539.14x = 291,245.90
  5. Step 5: Solve for x
    x = 291,245.90/539.14
  6. Step 6: Final answer
    x = 540.20

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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.