Home / 1,987.68-2,742.60-1,103.36

Finding the Fourth Proportional to 1,987.68, 2,742.60 and 1,103.36

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Solution

The fourth proportional to 1,987.68, 2,742.60 and 1,103.36 is: 1,522.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.68 : 2,742.60 = 1,103.36 : x
  2. Step 2: Convert to fraction form
    1,987.68/2,742.60 = 1,103.36/x
  3. Step 3: Cross multiply
    1,987.68x = 2,742.60 × 1,103.36
  4. Step 4: Simplify right side
    1,987.68x = 3,026,075.14
  5. Step 5: Solve for x
    x = 3,026,075.14/1,987.68
  6. Step 6: Final answer
    x = 1,522.42

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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.