Home / 1,989.22-2,742.20-1,242.84

Finding the Fourth Proportional to 1,989.22, 2,742.20 and 1,242.84

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Solution

The fourth proportional to 1,989.22, 2,742.20 and 1,242.84 is: 1,713.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.22 : 2,742.20 = 1,242.84 : x
  2. Step 2: Convert to fraction form
    1,989.22/2,742.20 = 1,242.84/x
  3. Step 3: Cross multiply
    1,989.22x = 2,742.20 × 1,242.84
  4. Step 4: Simplify right side
    1,989.22x = 3,408,115.85
  5. Step 5: Solve for x
    x = 3,408,115.85/1,989.22
  6. Step 6: Final answer
    x = 1,713.29

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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.