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Finding the Fourth Proportional to 981, 1,471.48 and 331.78

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Solution

The fourth proportional to 981, 1,471.48 and 331.78 is: 497.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    981 : 1,471.48 = 331.78 : x
  2. Step 2: Convert to fraction form
    981/1,471.48 = 331.78/x
  3. Step 3: Cross multiply
    981x = 1,471.48 × 331.78
  4. Step 4: Simplify right side
    981x = 488,207.63
  5. Step 5: Solve for x
    x = 488,207.63/981
  6. Step 6: Final answer
    x = 497.66

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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.