Home / 1,989.12-2,742.52-1,279.76

Finding the Fourth Proportional to 1,989.12, 2,742.52 and 1,279.76

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Solution

The fourth proportional to 1,989.12, 2,742.52 and 1,279.76 is: 1,764.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.12 : 2,742.52 = 1,279.76 : x
  2. Step 2: Convert to fraction form
    1,989.12/2,742.52 = 1,279.76/x
  3. Step 3: Cross multiply
    1,989.12x = 2,742.52 × 1,279.76
  4. Step 4: Simplify right side
    1,989.12x = 3,509,767.40
  5. Step 5: Solve for x
    x = 3,509,767.40/1,989.12
  6. Step 6: Final answer
    x = 1,764.48

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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.