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Finding the Fourth Proportional to 539.38, 744.15 and 487

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Solution

The fourth proportional to 539.38, 744.15 and 487 is: 671.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.38 : 744.15 = 487 : x
  2. Step 2: Convert to fraction form
    539.38/744.15 = 487/x
  3. Step 3: Cross multiply
    539.38x = 744.15 × 487
  4. Step 4: Simplify right side
    539.38x = 362,401.05
  5. Step 5: Solve for x
    x = 362,401.05/539.38
  6. Step 6: Final answer
    x = 671.88

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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.