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Finding the Fourth Proportional to 1,988.80, 2,744.00 and 1,243.86

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Solution

The fourth proportional to 1,988.80, 2,744.00 and 1,243.86 is: 1,716.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.80 : 2,744.00 = 1,243.86 : x
  2. Step 2: Convert to fraction form
    1,988.80/2,744.00 = 1,243.86/x
  3. Step 3: Cross multiply
    1,988.80x = 2,744.00 × 1,243.86
  4. Step 4: Simplify right side
    1,988.80x = 3,413,143.49
  5. Step 5: Solve for x
    x = 3,413,143.49/1,988.80
  6. Step 6: Final answer
    x = 1,716.18

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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.