Home / 21,121.44-31,687.20-7,270.56

Finding the Fourth Proportional to 21,121.44, 31,687.20 and 7,270.56

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Solution

The fourth proportional to 21,121.44, 31,687.20 and 7,270.56 is: 10,907.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.44 : 31,687.20 = 7,270.56 : x
  2. Step 2: Convert to fraction form
    21,121.44/31,687.20 = 7,270.56/x
  3. Step 3: Cross multiply
    21,121.44x = 31,687.20 × 7,270.56
  4. Step 4: Simplify right side
    21,121.44x = 230,383,688.83
  5. Step 5: Solve for x
    x = 230,383,688.83/21,121.44
  6. Step 6: Final answer
    x = 10,907.57

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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.