Home / 3,919.80-5,409.34-2,151.38

Finding the Fourth Proportional to 3,919.80, 5,409.34 and 2,151.38

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Solution

The fourth proportional to 3,919.80, 5,409.34 and 2,151.38 is: 2,968.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919.80 : 5,409.34 = 2,151.38 : x
  2. Step 2: Convert to fraction form
    3,919.80/5,409.34 = 2,151.38/x
  3. Step 3: Cross multiply
    3,919.80x = 5,409.34 × 2,151.38
  4. Step 4: Simplify right side
    3,919.80x = 11,637,545.89
  5. Step 5: Solve for x
    x = 11,637,545.89/3,919.80
  6. Step 6: Final answer
    x = 2,968.91

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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.