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Finding the Fourth Proportional to 539.42, 744.42 and 318.30

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Solution

The fourth proportional to 539.42, 744.42 and 318.30 is: 439.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.42 : 744.42 = 318.30 : x
  2. Step 2: Convert to fraction form
    539.42/744.42 = 318.30/x
  3. Step 3: Cross multiply
    539.42x = 744.42 × 318.30
  4. Step 4: Simplify right side
    539.42x = 236,948.89
  5. Step 5: Solve for x
    x = 236,948.89/539.42
  6. Step 6: Final answer
    x = 439.27

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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.