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Finding the Fourth Proportional to 631.28, 947.21 and 284.43

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Solution

The fourth proportional to 631.28, 947.21 and 284.43 is: 426.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.28 : 947.21 = 284.43 : x
  2. Step 2: Convert to fraction form
    631.28/947.21 = 284.43/x
  3. Step 3: Cross multiply
    631.28x = 947.21 × 284.43
  4. Step 4: Simplify right side
    631.28x = 269,414.94
  5. Step 5: Solve for x
    x = 269,414.94/631.28
  6. Step 6: Final answer
    x = 426.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.