Home / 3,920.13-5,409.81-2,151.90

Finding the Fourth Proportional to 3,920.13, 5,409.81 and 2,151.90

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Solution

The fourth proportional to 3,920.13, 5,409.81 and 2,151.90 is: 2,969.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.13 : 5,409.81 = 2,151.90 : x
  2. Step 2: Convert to fraction form
    3,920.13/5,409.81 = 2,151.90/x
  3. Step 3: Cross multiply
    3,920.13x = 5,409.81 × 2,151.90
  4. Step 4: Simplify right side
    3,920.13x = 11,641,370.14
  5. Step 5: Solve for x
    x = 11,641,370.14/3,920.13
  6. Step 6: Final answer
    x = 2,969.64

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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.