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Finding the Fourth Proportional to 284.08, 391.80 and 218.76

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Solution

The fourth proportional to 284.08, 391.80 and 218.76 is: 301.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.08 : 391.80 = 218.76 : x
  2. Step 2: Convert to fraction form
    284.08/391.80 = 218.76/x
  3. Step 3: Cross multiply
    284.08x = 391.80 × 218.76
  4. Step 4: Simplify right side
    284.08x = 85,710.17
  5. Step 5: Solve for x
    x = 85,710.17/284.08
  6. Step 6: Final answer
    x = 301.71

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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.