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Finding the Fourth Proportional to 539.20, 744.24 and 391.58

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Solution

The fourth proportional to 539.20, 744.24 and 391.58 is: 540.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.20 : 744.24 = 391.58 : x
  2. Step 2: Convert to fraction form
    539.20/744.24 = 391.58/x
  3. Step 3: Cross multiply
    539.20x = 744.24 × 391.58
  4. Step 4: Simplify right side
    539.20x = 291,429.50
  5. Step 5: Solve for x
    x = 291,429.50/539.20
  6. Step 6: Final answer
    x = 540.48

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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.