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Finding the Fourth Proportional to 974.12, 1,460.46 and 426.20

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Solution

The fourth proportional to 974.12, 1,460.46 and 426.20 is: 638.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.12 : 1,460.46 = 426.20 : x
  2. Step 2: Convert to fraction form
    974.12/1,460.46 = 426.20/x
  3. Step 3: Cross multiply
    974.12x = 1,460.46 × 426.20
  4. Step 4: Simplify right side
    974.12x = 622,448.05
  5. Step 5: Solve for x
    x = 622,448.05/974.12
  6. Step 6: Final answer
    x = 638.98

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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.