Home / 7,991.20-11,986.80-2,148.40

Finding the Fourth Proportional to 7,991.20, 11,986.80 and 2,148.40

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Solution

The fourth proportional to 7,991.20, 11,986.80 and 2,148.40 is: 3,222.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.20 : 11,986.80 = 2,148.40 : x
  2. Step 2: Convert to fraction form
    7,991.20/11,986.80 = 2,148.40/x
  3. Step 3: Cross multiply
    7,991.20x = 11,986.80 × 2,148.40
  4. Step 4: Simplify right side
    7,991.20x = 25,752,441.12
  5. Step 5: Solve for x
    x = 25,752,441.12/7,991.20
  6. Step 6: Final answer
    x = 3,222.60

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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.