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Finding the Fourth Proportional to 1,449.05, 1,999.68 and 819.70

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Solution

The fourth proportional to 1,449.05, 1,999.68 and 819.70 is: 1,131.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.05 : 1,999.68 = 819.70 : x
  2. Step 2: Convert to fraction form
    1,449.05/1,999.68 = 819.70/x
  3. Step 3: Cross multiply
    1,449.05x = 1,999.68 × 819.70
  4. Step 4: Simplify right side
    1,449.05x = 1,639,140.65
  5. Step 5: Solve for x
    x = 1,639,140.65/1,449.05
  6. Step 6: Final answer
    x = 1,131.18

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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.