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Finding the Fourth Proportional to 206.81, 285.20 and 160.29

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Solution

The fourth proportional to 206.81, 285.20 and 160.29 is: 221.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.81 : 285.20 = 160.29 : x
  2. Step 2: Convert to fraction form
    206.81/285.20 = 160.29/x
  3. Step 3: Cross multiply
    206.81x = 285.20 × 160.29
  4. Step 4: Simplify right side
    206.81x = 45,713.91
  5. Step 5: Solve for x
    x = 45,713.91/206.81
  6. Step 6: Final answer
    x = 221.05

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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.