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Finding the Fourth Proportional to 974.28, 1,461.27 and 426.31

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Solution

The fourth proportional to 974.28, 1,461.27 and 426.31 is: 639.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.28 : 1,461.27 = 426.31 : x
  2. Step 2: Convert to fraction form
    974.28/1,461.27 = 426.31/x
  3. Step 3: Cross multiply
    974.28x = 1,461.27 × 426.31
  4. Step 4: Simplify right side
    974.28x = 622,956.58
  5. Step 5: Solve for x
    x = 622,956.58/974.28
  6. Step 6: Final answer
    x = 639.40

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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.