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Finding the Fourth Proportional to 443.28, 611.82 and 256.80

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Solution

The fourth proportional to 443.28, 611.82 and 256.80 is: 354.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.28 : 611.82 = 256.80 : x
  2. Step 2: Convert to fraction form
    443.28/611.82 = 256.80/x
  3. Step 3: Cross multiply
    443.28x = 611.82 × 256.80
  4. Step 4: Simplify right side
    443.28x = 157,115.38
  5. Step 5: Solve for x
    x = 157,115.38/443.28
  6. Step 6: Final answer
    x = 354.44

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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.