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Finding the Fourth Proportional to 206.80, 285.48 and 157.88

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Solution

The fourth proportional to 206.80, 285.48 and 157.88 is: 217.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.80 : 285.48 = 157.88 : x
  2. Step 2: Convert to fraction form
    206.80/285.48 = 157.88/x
  3. Step 3: Cross multiply
    206.80x = 285.48 × 157.88
  4. Step 4: Simplify right side
    206.80x = 45,071.58
  5. Step 5: Solve for x
    x = 45,071.58/206.80
  6. Step 6: Final answer
    x = 217.95

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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.