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Finding the Fourth Proportional to 981.82, 1,471.29 and 615.55

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Solution

The fourth proportional to 981.82, 1,471.29 and 615.55 is: 922.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.82 : 1,471.29 = 615.55 : x
  2. Step 2: Convert to fraction form
    981.82/1,471.29 = 615.55/x
  3. Step 3: Cross multiply
    981.82x = 1,471.29 × 615.55
  4. Step 4: Simplify right side
    981.82x = 905,652.56
  5. Step 5: Solve for x
    x = 905,652.56/981.82
  6. Step 6: Final answer
    x = 922.42

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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.