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Finding the Fourth Proportional to 539.45, 744.23 and 391.76

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Solution

The fourth proportional to 539.45, 744.23 and 391.76 is: 540.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.45 : 744.23 = 391.76 : x
  2. Step 2: Convert to fraction form
    539.45/744.23 = 391.76/x
  3. Step 3: Cross multiply
    539.45x = 744.23 × 391.76
  4. Step 4: Simplify right side
    539.45x = 291,557.59
  5. Step 5: Solve for x
    x = 291,557.59/539.45
  6. Step 6: Final answer
    x = 540.47

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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.