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Finding the Fourth Proportional to 443.26, 611.31 and 318.72

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Solution

The fourth proportional to 443.26, 611.31 and 318.72 is: 439.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.26 : 611.31 = 318.72 : x
  2. Step 2: Convert to fraction form
    443.26/611.31 = 318.72/x
  3. Step 3: Cross multiply
    443.26x = 611.31 × 318.72
  4. Step 4: Simplify right side
    443.26x = 194,836.72
  5. Step 5: Solve for x
    x = 194,836.72/443.26
  6. Step 6: Final answer
    x = 439.55

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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.