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Finding the Fourth Proportional to 284.16, 391.80 and 221.16

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Solution

The fourth proportional to 284.16, 391.80 and 221.16 is: 304.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.16 : 391.80 = 221.16 : x
  2. Step 2: Convert to fraction form
    284.16/391.80 = 221.16/x
  3. Step 3: Cross multiply
    284.16x = 391.80 × 221.16
  4. Step 4: Simplify right side
    284.16x = 86,650.49
  5. Step 5: Solve for x
    x = 86,650.49/284.16
  6. Step 6: Final answer
    x = 304.94

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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.