Home / 1,988.78-2,743.38-1,191.87

Finding the Fourth Proportional to 1,988.78, 2,743.38 and 1,191.87

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Solution

The fourth proportional to 1,988.78, 2,743.38 and 1,191.87 is: 1,644.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.78 : 2,743.38 = 1,191.87 : x
  2. Step 2: Convert to fraction form
    1,988.78/2,743.38 = 1,191.87/x
  3. Step 3: Cross multiply
    1,988.78x = 2,743.38 × 1,191.87
  4. Step 4: Simplify right side
    1,988.78x = 3,269,752.32
  5. Step 5: Solve for x
    x = 3,269,752.32/1,988.78
  6. Step 6: Final answer
    x = 1,644.10

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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.