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Finding the Fourth Proportional to 449.96, 674.92 and 257.72

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Solution

The fourth proportional to 449.96, 674.92 and 257.72 is: 386.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.96 : 674.92 = 257.72 : x
  2. Step 2: Convert to fraction form
    449.96/674.92 = 257.72/x
  3. Step 3: Cross multiply
    449.96x = 674.92 × 257.72
  4. Step 4: Simplify right side
    449.96x = 173,940.38
  5. Step 5: Solve for x
    x = 173,940.38/449.96
  6. Step 6: Final answer
    x = 386.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.