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Finding the Fourth Proportional to 449.68, 619.92 and 318.64

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Solution

The fourth proportional to 449.68, 619.92 and 318.64 is: 439.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.68 : 619.92 = 318.64 : x
  2. Step 2: Convert to fraction form
    449.68/619.92 = 318.64/x
  3. Step 3: Cross multiply
    449.68x = 619.92 × 318.64
  4. Step 4: Simplify right side
    449.68x = 197,531.31
  5. Step 5: Solve for x
    x = 197,531.31/449.68
  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.