Home / 1,988.22-2,743.98-1,191.78

Finding the Fourth Proportional to 1,988.22, 2,743.98 and 1,191.78

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Solution

The fourth proportional to 1,988.22, 2,743.98 and 1,191.78 is: 1,644.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.22 : 2,743.98 = 1,191.78 : x
  2. Step 2: Convert to fraction form
    1,988.22/2,743.98 = 1,191.78/x
  3. Step 3: Cross multiply
    1,988.22x = 2,743.98 × 1,191.78
  4. Step 4: Simplify right side
    1,988.22x = 3,270,220.48
  5. Step 5: Solve for x
    x = 3,270,220.48/1,988.22
  6. Step 6: Final answer
    x = 1,644.80

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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.