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Finding the Fourth Proportional to 206.49, 285 and 131.76

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Solution

The fourth proportional to 206.49, 285 and 131.76 is: 181.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.49 : 285 = 131.76 : x
  2. Step 2: Convert to fraction form
    206.49/285 = 131.76/x
  3. Step 3: Cross multiply
    206.49x = 285 × 131.76
  4. Step 4: Simplify right side
    206.49x = 37,551.60
  5. Step 5: Solve for x
    x = 37,551.60/206.49
  6. Step 6: Final answer
    x = 181.86

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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.