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Finding the Fourth Proportional to 981.38, 1,471.96 and 288.05

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Solution

The fourth proportional to 981.38, 1,471.96 and 288.05 is: 432.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.38 : 1,471.96 = 288.05 : x
  2. Step 2: Convert to fraction form
    981.38/1,471.96 = 288.05/x
  3. Step 3: Cross multiply
    981.38x = 1,471.96 × 288.05
  4. Step 4: Simplify right side
    981.38x = 423,997.74
  5. Step 5: Solve for x
    x = 423,997.74/981.38
  6. Step 6: Final answer
    x = 432.04

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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.