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Finding the Fourth Proportional to 539.33, 744.15 and 391.71

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Solution

The fourth proportional to 539.33, 744.15 and 391.71 is: 540.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.33 : 744.15 = 391.71 : x
  2. Step 2: Convert to fraction form
    539.33/744.15 = 391.71/x
  3. Step 3: Cross multiply
    539.33x = 744.15 × 391.71
  4. Step 4: Simplify right side
    539.33x = 291,486.74
  5. Step 5: Solve for x
    x = 291,486.74/539.33
  6. Step 6: Final answer
    x = 540.46

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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.