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Finding the Fourth Proportional to 284.10, 391.76 and 221.82

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Solution

The fourth proportional to 284.10, 391.76 and 221.82 is: 305.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.10 : 391.76 = 221.82 : x
  2. Step 2: Convert to fraction form
    284.10/391.76 = 221.82/x
  3. Step 3: Cross multiply
    284.10x = 391.76 × 221.82
  4. Step 4: Simplify right side
    284.10x = 86,900.20
  5. Step 5: Solve for x
    x = 86,900.20/284.10
  6. Step 6: Final answer
    x = 305.88

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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.