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Finding the Fourth Proportional to 981.64, 1,471.20 and 819.64

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Solution

The fourth proportional to 981.64, 1,471.20 and 819.64 is: 1,228.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.64 : 1,471.20 = 819.64 : x
  2. Step 2: Convert to fraction form
    981.64/1,471.20 = 819.64/x
  3. Step 3: Cross multiply
    981.64x = 1,471.20 × 819.64
  4. Step 4: Simplify right side
    981.64x = 1,205,854.37
  5. Step 5: Solve for x
    x = 1,205,854.37/981.64
  6. Step 6: Final answer
    x = 1,228.41

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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.