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Finding the Fourth Proportional to 539.28, 744.15 and 306.39

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Solution

The fourth proportional to 539.28, 744.15 and 306.39 is: 422.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.28 : 744.15 = 306.39 : x
  2. Step 2: Convert to fraction form
    539.28/744.15 = 306.39/x
  3. Step 3: Cross multiply
    539.28x = 744.15 × 306.39
  4. Step 4: Simplify right side
    539.28x = 228,000.12
  5. Step 5: Solve for x
    x = 228,000.12/539.28
  6. Step 6: Final answer
    x = 422.79

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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.