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Finding the Fourth Proportional to 980.73, 1,471.28 and 425.43

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Solution

The fourth proportional to 980.73, 1,471.28 and 425.43 is: 638.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.73 : 1,471.28 = 425.43 : x
  2. Step 2: Convert to fraction form
    980.73/1,471.28 = 425.43/x
  3. Step 3: Cross multiply
    980.73x = 1,471.28 × 425.43
  4. Step 4: Simplify right side
    980.73x = 625,926.65
  5. Step 5: Solve for x
    x = 625,926.65/980.73
  6. Step 6: Final answer
    x = 638.23

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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.