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Finding the Fourth Proportional to 206.38, 284.85 and 136.45

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Solution

The fourth proportional to 206.38, 284.85 and 136.45 is: 188.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.38 : 284.85 = 136.45 : x
  2. Step 2: Convert to fraction form
    206.38/284.85 = 136.45/x
  3. Step 3: Cross multiply
    206.38x = 284.85 × 136.45
  4. Step 4: Simplify right side
    206.38x = 38,867.78
  5. Step 5: Solve for x
    x = 38,867.78/206.38
  6. Step 6: Final answer
    x = 188.33

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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.