Home / 5,121.21-7,680.38-1,422.56

Finding the Fourth Proportional to 5,121.21, 7,680.38 and 1,422.56

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Solution

The fourth proportional to 5,121.21, 7,680.38 and 1,422.56 is: 2,133.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,121.21 : 7,680.38 = 1,422.56 : x
  2. Step 2: Convert to fraction form
    5,121.21/7,680.38 = 1,422.56/x
  3. Step 3: Cross multiply
    5,121.21x = 7,680.38 × 1,422.56
  4. Step 4: Simplify right side
    5,121.21x = 10,925,755.86
  5. Step 5: Solve for x
    x = 10,925,755.86/5,121.21
  6. Step 6: Final answer
    x = 2,133.43

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1.5x scale

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.