Home / 2,749.80-4,122-1,288.20

Finding the Fourth Proportional to 2,749.80, 4,122 and 1,288.20

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Solution

The fourth proportional to 2,749.80, 4,122 and 1,288.20 is: 1,931.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,749.80 : 4,122 = 1,288.20 : x
  2. Step 2: Convert to fraction form
    2,749.80/4,122 = 1,288.20/x
  3. Step 3: Cross multiply
    2,749.80x = 4,122 × 1,288.20
  4. Step 4: Simplify right side
    2,749.80x = 5,309,960.40
  5. Step 5: Solve for x
    x = 5,309,960.40/2,749.80
  6. Step 6: Final answer
    x = 1,931.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.