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Finding the Fourth Proportional to 981.20, 1,471.79 and 331.93

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Solution

The fourth proportional to 981.20, 1,471.79 and 331.93 is: 497.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.20 : 1,471.79 = 331.93 : x
  2. Step 2: Convert to fraction form
    981.20/1,471.79 = 331.93/x
  3. Step 3: Cross multiply
    981.20x = 1,471.79 × 331.93
  4. Step 4: Simplify right side
    981.20x = 488,531.25
  5. Step 5: Solve for x
    x = 488,531.25/981.20
  6. Step 6: Final answer
    x = 497.89

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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.