Home / 1,921.12-2,650.46-1,222.88

Finding the Fourth Proportional to 1,921.12, 2,650.46 and 1,222.88

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Solution

The fourth proportional to 1,921.12, 2,650.46 and 1,222.88 is: 1,687.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.12 : 2,650.46 = 1,222.88 : x
  2. Step 2: Convert to fraction form
    1,921.12/2,650.46 = 1,222.88/x
  3. Step 3: Cross multiply
    1,921.12x = 2,650.46 × 1,222.88
  4. Step 4: Simplify right side
    1,921.12x = 3,241,194.52
  5. Step 5: Solve for x
    x = 3,241,194.52/1,921.12
  6. Step 6: Final answer
    x = 1,687.14

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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.