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Finding the Fourth Proportional to 1,212.13, 1,672.84 and 769.87

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Solution

The fourth proportional to 1,212.13, 1,672.84 and 769.87 is: 1,062.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.13 : 1,672.84 = 769.87 : x
  2. Step 2: Convert to fraction form
    1,212.13/1,672.84 = 769.87/x
  3. Step 3: Cross multiply
    1,212.13x = 1,672.84 × 769.87
  4. Step 4: Simplify right side
    1,212.13x = 1,287,860.97
  5. Step 5: Solve for x
    x = 1,287,860.97/1,212.13
  6. Step 6: Final answer
    x = 1,062.48

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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.