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Finding the Fourth Proportional to 981.20, 1,471.78 and 404.08

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Solution

The fourth proportional to 981.20, 1,471.78 and 404.08 is: 606.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.20 : 1,471.78 = 404.08 : x
  2. Step 2: Convert to fraction form
    981.20/1,471.78 = 404.08/x
  3. Step 3: Cross multiply
    981.20x = 1,471.78 × 404.08
  4. Step 4: Simplify right side
    981.20x = 594,716.86
  5. Step 5: Solve for x
    x = 594,716.86/981.20
  6. Step 6: Final answer
    x = 606.11

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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.