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Finding the Fourth Proportional to 1,448.91, 1,999.60 and 819.65

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Solution

The fourth proportional to 1,448.91, 1,999.60 and 819.65 is: 1,131.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,448.91 : 1,999.60 = 819.65 : x
  2. Step 2: Convert to fraction form
    1,448.91/1,999.60 = 819.65/x
  3. Step 3: Cross multiply
    1,448.91x = 1,999.60 × 819.65
  4. Step 4: Simplify right side
    1,448.91x = 1,638,975.09
  5. Step 5: Solve for x
    x = 1,638,975.09/1,448.91
  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.