Home / 1,921.28-2,651.76-1,257.89

Finding the Fourth Proportional to 1,921.28, 2,651.76 and 1,257.89

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Solution

The fourth proportional to 1,921.28, 2,651.76 and 1,257.89 is: 1,736.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.28 : 2,651.76 = 1,257.89 : x
  2. Step 2: Convert to fraction form
    1,921.28/2,651.76 = 1,257.89/x
  3. Step 3: Cross multiply
    1,921.28x = 2,651.76 × 1,257.89
  4. Step 4: Simplify right side
    1,921.28x = 3,335,616.10
  5. Step 5: Solve for x
    x = 3,335,616.10/1,921.28
  6. Step 6: Final answer
    x = 1,736.14

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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.