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Finding the Fourth Proportional to 206.92, 285.54 and 136.90

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Solution

The fourth proportional to 206.92, 285.54 and 136.90 is: 188.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.92 : 285.54 = 136.90 : x
  2. Step 2: Convert to fraction form
    206.92/285.54 = 136.90/x
  3. Step 3: Cross multiply
    206.92x = 285.54 × 136.90
  4. Step 4: Simplify right side
    206.92x = 39,090.43
  5. Step 5: Solve for x
    x = 39,090.43/206.92
  6. Step 6: Final answer
    x = 188.92

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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.