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Finding the Fourth Proportional to 449.72, 620.96 and 318.90

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Solution

The fourth proportional to 449.72, 620.96 and 318.90 is: 440.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.72 : 620.96 = 318.90 : x
  2. Step 2: Convert to fraction form
    449.72/620.96 = 318.90/x
  3. Step 3: Cross multiply
    449.72x = 620.96 × 318.90
  4. Step 4: Simplify right side
    449.72x = 198,024.14
  5. Step 5: Solve for x
    x = 198,024.14/449.72
  6. Step 6: Final answer
    x = 440.33

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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.