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Finding the Fourth Proportional to 539.53, 744.55 and 318.61

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Solution

The fourth proportional to 539.53, 744.55 and 318.61 is: 439.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.53 : 744.55 = 318.61 : x
  2. Step 2: Convert to fraction form
    539.53/744.55 = 318.61/x
  3. Step 3: Cross multiply
    539.53x = 744.55 × 318.61
  4. Step 4: Simplify right side
    539.53x = 237,221.08
  5. Step 5: Solve for x
    x = 237,221.08/539.53
  6. Step 6: Final answer
    x = 439.68

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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.