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Finding the Fourth Proportional to 449.92, 619.28 and 318.70

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Solution

The fourth proportional to 449.92, 619.28 and 318.70 is: 438.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.92 : 619.28 = 318.70 : x
  2. Step 2: Convert to fraction form
    449.92/619.28 = 318.70/x
  3. Step 3: Cross multiply
    449.92x = 619.28 × 318.70
  4. Step 4: Simplify right side
    449.92x = 197,361.39
  5. Step 5: Solve for x
    x = 197,361.39/449.92
  6. Step 6: Final answer
    x = 438.66

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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.