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Finding the Fourth Proportional to 982.20, 1,471.38 and 638.52

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Solution

The fourth proportional to 982.20, 1,471.38 and 638.52 is: 956.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.20 : 1,471.38 = 638.52 : x
  2. Step 2: Convert to fraction form
    982.20/1,471.38 = 638.52/x
  3. Step 3: Cross multiply
    982.20x = 1,471.38 × 638.52
  4. Step 4: Simplify right side
    982.20x = 939,505.56
  5. Step 5: Solve for x
    x = 939,505.56/982.20
  6. Step 6: Final answer
    x = 956.53

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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.