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Finding the Fourth Proportional to 206.79, 285.35 and 119.45

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Solution

The fourth proportional to 206.79, 285.35 and 119.45 is: 164.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.79 : 285.35 = 119.45 : x
  2. Step 2: Convert to fraction form
    206.79/285.35 = 119.45/x
  3. Step 3: Cross multiply
    206.79x = 285.35 × 119.45
  4. Step 4: Simplify right side
    206.79x = 34,083.03
  5. Step 5: Solve for x
    x = 34,083.03/206.79
  6. Step 6: Final answer
    x = 164.82

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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.