Home / 1,987.29-2,742.39-1,103.13

Finding the Fourth Proportional to 1,987.29, 2,742.39 and 1,103.13

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Solution

The fourth proportional to 1,987.29, 2,742.39 and 1,103.13 is: 1,522.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.29 : 2,742.39 = 1,103.13 : x
  2. Step 2: Convert to fraction form
    1,987.29/2,742.39 = 1,103.13/x
  3. Step 3: Cross multiply
    1,987.29x = 2,742.39 × 1,103.13
  4. Step 4: Simplify right side
    1,987.29x = 3,025,212.68
  5. Step 5: Solve for x
    x = 3,025,212.68/1,987.29
  6. Step 6: Final answer
    x = 1,522.28

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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.