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Finding the Fourth Proportional to 1,368.62, 2,049.84 and 819.65

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Solution

The fourth proportional to 1,368.62, 2,049.84 and 819.65 is: 1,227.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.62 : 2,049.84 = 819.65 : x
  2. Step 2: Convert to fraction form
    1,368.62/2,049.84 = 819.65/x
  3. Step 3: Cross multiply
    1,368.62x = 2,049.84 × 819.65
  4. Step 4: Simplify right side
    1,368.62x = 1,680,144.18
  5. Step 5: Solve for x
    x = 1,680,144.18/1,368.62
  6. Step 6: Final answer
    x = 1,227.62

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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.