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Finding the Fourth Proportional to 206.66, 285.12 and 136.82

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Solution

The fourth proportional to 206.66, 285.12 and 136.82 is: 188.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.66 : 285.12 = 136.82 : x
  2. Step 2: Convert to fraction form
    206.66/285.12 = 136.82/x
  3. Step 3: Cross multiply
    206.66x = 285.12 × 136.82
  4. Step 4: Simplify right side
    206.66x = 39,010.12
  5. Step 5: Solve for x
    x = 39,010.12/206.66
  6. Step 6: Final answer
    x = 188.76

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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.