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Finding the Fourth Proportional to 206.60, 285.11 and 112.08

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Solution

The fourth proportional to 206.60, 285.11 and 112.08 is: 154.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.60 : 285.11 = 112.08 : x
  2. Step 2: Convert to fraction form
    206.60/285.11 = 112.08/x
  3. Step 3: Cross multiply
    206.60x = 285.11 × 112.08
  4. Step 4: Simplify right side
    206.60x = 31,953.70
  5. Step 5: Solve for x
    x = 31,953.70/206.60
  6. Step 6: Final answer
    x = 154.66

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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.