Home / 3,919.77-5,409.28-2,151.37

Finding the Fourth Proportional to 3,919.77, 5,409.28 and 2,151.37

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Solution

The fourth proportional to 3,919.77, 5,409.28 and 2,151.37 is: 2,968.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919.77 : 5,409.28 = 2,151.37 : x
  2. Step 2: Convert to fraction form
    3,919.77/5,409.28 = 2,151.37/x
  3. Step 3: Cross multiply
    3,919.77x = 5,409.28 × 2,151.37
  4. Step 4: Simplify right side
    3,919.77x = 11,637,372.16
  5. Step 5: Solve for x
    x = 11,637,372.16/3,919.77
  6. Step 6: Final answer
    x = 2,968.89

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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.