Home / 3,920.20-5,409.88-2,151.81

Finding the Fourth Proportional to 3,920.20, 5,409.88 and 2,151.81

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Solution

The fourth proportional to 3,920.20, 5,409.88 and 2,151.81 is: 2,969.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.20 : 5,409.88 = 2,151.81 : x
  2. Step 2: Convert to fraction form
    3,920.20/5,409.88 = 2,151.81/x
  3. Step 3: Cross multiply
    3,920.20x = 5,409.88 × 2,151.81
  4. Step 4: Simplify right side
    3,920.20x = 11,641,033.88
  5. Step 5: Solve for x
    x = 11,641,033.88/3,920.20
  6. Step 6: Final answer
    x = 2,969.50

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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.