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Finding the Fourth Proportional to 206.49, 309.82 and 76.50

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Solution

The fourth proportional to 206.49, 309.82 and 76.50 is: 114.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.49 : 309.82 = 76.50 : x
  2. Step 2: Convert to fraction form
    206.49/309.82 = 76.50/x
  3. Step 3: Cross multiply
    206.49x = 309.82 × 76.50
  4. Step 4: Simplify right side
    206.49x = 23,701.23
  5. Step 5: Solve for x
    x = 23,701.23/206.49
  6. Step 6: Final answer
    x = 114.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.