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Finding the Fourth Proportional to 3,919.99, 5,409.68 and 2,151.71

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Solution

The fourth proportional to 3,919.99, 5,409.68 and 2,151.71 is: 2,969.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919.99 : 5,409.68 = 2,151.71 : x
  2. Step 2: Convert to fraction form
    3,919.99/5,409.68 = 2,151.71/x
  3. Step 3: Cross multiply
    3,919.99x = 5,409.68 × 2,151.71
  4. Step 4: Simplify right side
    3,919.99x = 11,640,062.55
  5. Step 5: Solve for x
    x = 11,640,062.55/3,919.99
  6. Step 6: Final answer
    x = 2,969.41

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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.