Home / 1,422.20-2,135.10-764.60

Finding the Fourth Proportional to 1,422.20, 2,135.10 and 764.60

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Solution

The fourth proportional to 1,422.20, 2,135.10 and 764.60 is: 1,147.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.20 : 2,135.10 = 764.60 : x
  2. Step 2: Convert to fraction form
    1,422.20/2,135.10 = 764.60/x
  3. Step 3: Cross multiply
    1,422.20x = 2,135.10 × 764.60
  4. Step 4: Simplify right side
    1,422.20x = 1,632,497.46
  5. Step 5: Solve for x
    x = 1,632,497.46/1,422.20
  6. Step 6: Final answer
    x = 1,147.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.