Home / 1,919.28-2,648.36-1,221.06

Finding the Fourth Proportional to 1,919.28, 2,648.36 and 1,221.06

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Solution

The fourth proportional to 1,919.28, 2,648.36 and 1,221.06 is: 1,684.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.28 : 2,648.36 = 1,221.06 : x
  2. Step 2: Convert to fraction form
    1,919.28/2,648.36 = 1,221.06/x
  3. Step 3: Cross multiply
    1,919.28x = 2,648.36 × 1,221.06
  4. Step 4: Simplify right side
    1,919.28x = 3,233,806.46
  5. Step 5: Solve for x
    x = 3,233,806.46/1,919.28
  6. Step 6: Final answer
    x = 1,684.91

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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.