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Finding the Fourth Proportional to 3,920.01, 5,409.86 and 2,151.87

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Solution

The fourth proportional to 3,920.01, 5,409.86 and 2,151.87 is: 2,969.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.01 : 5,409.86 = 2,151.87 : x
  2. Step 2: Convert to fraction form
    3,920.01/5,409.86 = 2,151.87/x
  3. Step 3: Cross multiply
    3,920.01x = 5,409.86 × 2,151.87
  4. Step 4: Simplify right side
    3,920.01x = 11,641,304.68
  5. Step 5: Solve for x
    x = 11,641,304.68/3,920.01
  6. Step 6: Final answer
    x = 2,969.71

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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.