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Finding the Fourth Proportional to 539.42, 744.23 and 318.43

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Solution

The fourth proportional to 539.42, 744.23 and 318.43 is: 439.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.42 : 744.23 = 318.43 : x
  2. Step 2: Convert to fraction form
    539.42/744.23 = 318.43/x
  3. Step 3: Cross multiply
    539.42x = 744.23 × 318.43
  4. Step 4: Simplify right side
    539.42x = 236,984.34
  5. Step 5: Solve for x
    x = 236,984.34/539.42
  6. Step 6: Final answer
    x = 439.33

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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.