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Finding the Fourth Proportional to 443.28, 611.64 and 256.71

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Solution

The fourth proportional to 443.28, 611.64 and 256.71 is: 354.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.28 : 611.64 = 256.71 : x
  2. Step 2: Convert to fraction form
    443.28/611.64 = 256.71/x
  3. Step 3: Cross multiply
    443.28x = 611.64 × 256.71
  4. Step 4: Simplify right side
    443.28x = 157,014.10
  5. Step 5: Solve for x
    x = 157,014.10/443.28
  6. Step 6: Final answer
    x = 354.21

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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.