Home / 3,171.88-4,378.40-2,839.72

Finding the Fourth Proportional to 3,171.88, 4,378.40 and 2,839.72

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Solution

The fourth proportional to 3,171.88, 4,378.40 and 2,839.72 is: 3,919.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,171.88 : 4,378.40 = 2,839.72 : x
  2. Step 2: Convert to fraction form
    3,171.88/4,378.40 = 2,839.72/x
  3. Step 3: Cross multiply
    3,171.88x = 4,378.40 × 2,839.72
  4. Step 4: Simplify right side
    3,171.88x = 12,433,430.05
  5. Step 5: Solve for x
    x = 12,433,430.05/3,171.88
  6. Step 6: Final answer
    x = 3,919.89

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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.