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Finding the Fourth Proportional to 449.28, 618.48 and 393.92

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Solution

The fourth proportional to 449.28, 618.48 and 393.92 is: 542.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.28 : 618.48 = 393.92 : x
  2. Step 2: Convert to fraction form
    449.28/618.48 = 393.92/x
  3. Step 3: Cross multiply
    449.28x = 618.48 × 393.92
  4. Step 4: Simplify right side
    449.28x = 243,631.64
  5. Step 5: Solve for x
    x = 243,631.64/449.28
  6. Step 6: Final answer
    x = 542.27

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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.