Home / 1,987.05-2,742.07-1,102.85

Finding the Fourth Proportional to 1,987.05, 2,742.07 and 1,102.85

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Solution

The fourth proportional to 1,987.05, 2,742.07 and 1,102.85 is: 1,521.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.05 : 2,742.07 = 1,102.85 : x
  2. Step 2: Convert to fraction form
    1,987.05/2,742.07 = 1,102.85/x
  3. Step 3: Cross multiply
    1,987.05x = 2,742.07 × 1,102.85
  4. Step 4: Simplify right side
    1,987.05x = 3,024,091.90
  5. Step 5: Solve for x
    x = 3,024,091.90/1,987.05
  6. Step 6: Final answer
    x = 1,521.90

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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.