Home / 1,987.12-2,742.09-1,102.85

Finding the Fourth Proportional to 1,987.12, 2,742.09 and 1,102.85

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Solution

The fourth proportional to 1,987.12, 2,742.09 and 1,102.85 is: 1,521.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.12 : 2,742.09 = 1,102.85 : x
  2. Step 2: Convert to fraction form
    1,987.12/2,742.09 = 1,102.85/x
  3. Step 3: Cross multiply
    1,987.12x = 2,742.09 × 1,102.85
  4. Step 4: Simplify right side
    1,987.12x = 3,024,106.39
  5. Step 5: Solve for x
    x = 3,024,106.39/1,987.12
  6. Step 6: Final answer
    x = 1,521.85

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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.