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Finding the Fourth Proportional to 539.67, 744.74 and 318.63

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Solution

The fourth proportional to 539.67, 744.74 and 318.63 is: 439.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.67 : 744.74 = 318.63 : x
  2. Step 2: Convert to fraction form
    539.67/744.74 = 318.63/x
  3. Step 3: Cross multiply
    539.67x = 744.74 × 318.63
  4. Step 4: Simplify right side
    539.67x = 237,294.91
  5. Step 5: Solve for x
    x = 237,294.91/539.67
  6. Step 6: Final answer
    x = 439.70

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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.