Home / 3,920.21-5,409.90-2,151.83

Finding the Fourth Proportional to 3,920.21, 5,409.90 and 2,151.83

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Solution

The fourth proportional to 3,920.21, 5,409.90 and 2,151.83 is: 2,969.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.21 : 5,409.90 = 2,151.83 : x
  2. Step 2: Convert to fraction form
    3,920.21/5,409.90 = 2,151.83/x
  3. Step 3: Cross multiply
    3,920.21x = 5,409.90 × 2,151.83
  4. Step 4: Simplify right side
    3,920.21x = 11,641,158.07
  5. Step 5: Solve for x
    x = 11,641,158.07/3,920.21
  6. Step 6: Final answer
    x = 2,969.53

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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.