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Finding the Fourth Proportional to 206.79, 285.45 and 133.20

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Solution

The fourth proportional to 206.79, 285.45 and 133.20 is: 183.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.79 : 285.45 = 133.20 : x
  2. Step 2: Convert to fraction form
    206.79/285.45 = 133.20/x
  3. Step 3: Cross multiply
    206.79x = 285.45 × 133.20
  4. Step 4: Simplify right side
    206.79x = 38,021.94
  5. Step 5: Solve for x
    x = 38,021.94/206.79
  6. Step 6: Final answer
    x = 183.87

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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.