Home / 1,987.12-2,744.07-1,280.19

Finding the Fourth Proportional to 1,987.12, 2,744.07 and 1,280.19

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Solution

The fourth proportional to 1,987.12, 2,744.07 and 1,280.19 is: 1,767.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.12 : 2,744.07 = 1,280.19 : x
  2. Step 2: Convert to fraction form
    1,987.12/2,744.07 = 1,280.19/x
  3. Step 3: Cross multiply
    1,987.12x = 2,744.07 × 1,280.19
  4. Step 4: Simplify right side
    1,987.12x = 3,512,930.97
  5. Step 5: Solve for x
    x = 3,512,930.97/1,987.12
  6. Step 6: Final answer
    x = 1,767.85

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1.5x scale

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.