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Finding the Fourth Proportional to 449.91, 621.18 and 318.69

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Solution

The fourth proportional to 449.91, 621.18 and 318.69 is: 440.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.91 : 621.18 = 318.69 : x
  2. Step 2: Convert to fraction form
    449.91/621.18 = 318.69/x
  3. Step 3: Cross multiply
    449.91x = 621.18 × 318.69
  4. Step 4: Simplify right side
    449.91x = 197,963.85
  5. Step 5: Solve for x
    x = 197,963.85/449.91
  6. Step 6: Final answer
    x = 440.01

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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.