Home / 3,920.32-5,409.61-2,151.91

Finding the Fourth Proportional to 3,920.32, 5,409.61 and 2,151.91

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Solution

The fourth proportional to 3,920.32, 5,409.61 and 2,151.91 is: 2,969.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.32 : 5,409.61 = 2,151.91 : x
  2. Step 2: Convert to fraction form
    3,920.32/5,409.61 = 2,151.91/x
  3. Step 3: Cross multiply
    3,920.32x = 5,409.61 × 2,151.91
  4. Step 4: Simplify right side
    3,920.32x = 11,640,993.86
  5. Step 5: Solve for x
    x = 11,640,993.86/3,920.32
  6. Step 6: Final answer
    x = 2,969.40

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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.