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Finding the Fourth Proportional to 982.71, 1,471.92 and 615.70

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Solution

The fourth proportional to 982.71, 1,471.92 and 615.70 is: 922.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.71 : 1,471.92 = 615.70 : x
  2. Step 2: Convert to fraction form
    982.71/1,471.92 = 615.70/x
  3. Step 3: Cross multiply
    982.71x = 1,471.92 × 615.70
  4. Step 4: Simplify right side
    982.71x = 906,264.14
  5. Step 5: Solve for x
    x = 906,264.14/982.71
  6. Step 6: Final answer
    x = 922.21

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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.