Home / 3,919.78-5,409.28-2,151.48

Finding the Fourth Proportional to 3,919.78, 5,409.28 and 2,151.48

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Solution

The fourth proportional to 3,919.78, 5,409.28 and 2,151.48 is: 2,969.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919.78 : 5,409.28 = 2,151.48 : x
  2. Step 2: Convert to fraction form
    3,919.78/5,409.28 = 2,151.48/x
  3. Step 3: Cross multiply
    3,919.78x = 5,409.28 × 2,151.48
  4. Step 4: Simplify right side
    3,919.78x = 11,637,957.73
  5. Step 5: Solve for x
    x = 11,637,957.73/3,919.78
  6. Step 6: Final answer
    x = 2,969.03

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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.