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Finding the Fourth Proportional to 284.85, 393.49 and 220.19

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Solution

The fourth proportional to 284.85, 393.49 and 220.19 is: 304.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.85 : 393.49 = 220.19 : x
  2. Step 2: Convert to fraction form
    284.85/393.49 = 220.19/x
  3. Step 3: Cross multiply
    284.85x = 393.49 × 220.19
  4. Step 4: Simplify right side
    284.85x = 86,640.87
  5. Step 5: Solve for x
    x = 86,640.87/284.85
  6. Step 6: Final answer
    x = 304.16

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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.