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Finding the Fourth Proportional to 443.31, 611.49 and 318.77

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Solution

The fourth proportional to 443.31, 611.49 and 318.77 is: 439.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.31 : 611.49 = 318.77 : x
  2. Step 2: Convert to fraction form
    443.31/611.49 = 318.77/x
  3. Step 3: Cross multiply
    443.31x = 611.49 × 318.77
  4. Step 4: Simplify right side
    443.31x = 194,923.43
  5. Step 5: Solve for x
    x = 194,923.43/443.31
  6. Step 6: Final answer
    x = 439.70

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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.