Home / 1,987.76-2,742.97-1,103.56

Finding the Fourth Proportional to 1,987.76, 2,742.97 and 1,103.56

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Solution

The fourth proportional to 1,987.76, 2,742.97 and 1,103.56 is: 1,522.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.76 : 2,742.97 = 1,103.56 : x
  2. Step 2: Convert to fraction form
    1,987.76/2,742.97 = 1,103.56/x
  3. Step 3: Cross multiply
    1,987.76x = 2,742.97 × 1,103.56
  4. Step 4: Simplify right side
    1,987.76x = 3,027,031.97
  5. Step 5: Solve for x
    x = 3,027,031.97/1,987.76
  6. Step 6: Final answer
    x = 1,522.84

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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.