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Finding the Fourth Proportional to 549.20, 757.32 and 393.68

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Solution

The fourth proportional to 549.20, 757.32 and 393.68 is: 542.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.20 : 757.32 = 393.68 : x
  2. Step 2: Convert to fraction form
    549.20/757.32 = 393.68/x
  3. Step 3: Cross multiply
    549.20x = 757.32 × 393.68
  4. Step 4: Simplify right side
    549.20x = 298,141.74
  5. Step 5: Solve for x
    x = 298,141.74/549.20
  6. Step 6: Final answer
    x = 542.87

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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.