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Finding the Fourth Proportional to 539.59, 744.78 and 318.61

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Solution

The fourth proportional to 539.59, 744.78 and 318.61 is: 439.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.59 : 744.78 = 318.61 : x
  2. Step 2: Convert to fraction form
    539.59/744.78 = 318.61/x
  3. Step 3: Cross multiply
    539.59x = 744.78 × 318.61
  4. Step 4: Simplify right side
    539.59x = 237,294.36
  5. Step 5: Solve for x
    x = 237,294.36/539.59
  6. Step 6: Final answer
    x = 439.77

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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.