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Finding the Fourth Proportional to 283.74, 391.71 and 221.43

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Solution

The fourth proportional to 283.74, 391.71 and 221.43 is: 305.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.74 : 391.71 = 221.43 : x
  2. Step 2: Convert to fraction form
    283.74/391.71 = 221.43/x
  3. Step 3: Cross multiply
    283.74x = 391.71 × 221.43
  4. Step 4: Simplify right side
    283.74x = 86,736.35
  5. Step 5: Solve for x
    x = 86,736.35/283.74
  6. Step 6: Final answer
    x = 305.69

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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.