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Finding the Fourth Proportional to 206.69, 285.17 and 135.79

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Solution

The fourth proportional to 206.69, 285.17 and 135.79 is: 187.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.69 : 285.17 = 135.79 : x
  2. Step 2: Convert to fraction form
    206.69/285.17 = 135.79/x
  3. Step 3: Cross multiply
    206.69x = 285.17 × 135.79
  4. Step 4: Simplify right side
    206.69x = 38,721.84
  5. Step 5: Solve for x
    x = 38,721.84/206.69
  6. Step 6: Final answer
    x = 187.35

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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.