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Finding the Fourth Proportional to 283.70, 391.29 and 213.78

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Solution

The fourth proportional to 283.70, 391.29 and 213.78 is: 294.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.70 : 391.29 = 213.78 : x
  2. Step 2: Convert to fraction form
    283.70/391.29 = 213.78/x
  3. Step 3: Cross multiply
    283.70x = 391.29 × 213.78
  4. Step 4: Simplify right side
    283.70x = 83,649.98
  5. Step 5: Solve for x
    x = 83,649.98/283.70
  6. Step 6: Final answer
    x = 294.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.