Home / 2,789.12-4,182.04-939.20

Finding the Fourth Proportional to 2,789.12, 4,182.04 and 939.20

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Solution

The fourth proportional to 2,789.12, 4,182.04 and 939.20 is: 1,408.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,789.12 : 4,182.04 = 939.20 : x
  2. Step 2: Convert to fraction form
    2,789.12/4,182.04 = 939.20/x
  3. Step 3: Cross multiply
    2,789.12x = 4,182.04 × 939.20
  4. Step 4: Simplify right side
    2,789.12x = 3,927,771.97
  5. Step 5: Solve for x
    x = 3,927,771.97/2,789.12
  6. Step 6: Final answer
    x = 1,408.25

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1.5x scale

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.