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Finding the Fourth Proportional to 538.48, 742.20 and 449.62

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Solution

The fourth proportional to 538.48, 742.20 and 449.62 is: 619.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.48 : 742.20 = 449.62 : x
  2. Step 2: Convert to fraction form
    538.48/742.20 = 449.62/x
  3. Step 3: Cross multiply
    538.48x = 742.20 × 449.62
  4. Step 4: Simplify right side
    538.48x = 333,704.42
  5. Step 5: Solve for x
    x = 333,704.42/538.48
  6. Step 6: Final answer
    x = 619.71

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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.