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Finding the Fourth Proportional to 206.79, 285.42 and 119.49

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Solution

The fourth proportional to 206.79, 285.42 and 119.49 is: 164.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.79 : 285.42 = 119.49 : x
  2. Step 2: Convert to fraction form
    206.79/285.42 = 119.49/x
  3. Step 3: Cross multiply
    206.79x = 285.42 × 119.49
  4. Step 4: Simplify right side
    206.79x = 34,104.84
  5. Step 5: Solve for x
    x = 34,104.84/206.79
  6. Step 6: Final answer
    x = 164.92

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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.