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Finding the Fourth Proportional to 284.15, 391.91 and 217.79

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Solution

The fourth proportional to 284.15, 391.91 and 217.79 is: 300.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.15 : 391.91 = 217.79 : x
  2. Step 2: Convert to fraction form
    284.15/391.91 = 217.79/x
  3. Step 3: Cross multiply
    284.15x = 391.91 × 217.79
  4. Step 4: Simplify right side
    284.15x = 85,352.50
  5. Step 5: Solve for x
    x = 85,352.50/284.15
  6. Step 6: Final answer
    x = 300.38

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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.