Home / 21,912.40-32,868.60-7,121.80

Finding the Fourth Proportional to 21,912.40, 32,868.60 and 7,121.80

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Solution

The fourth proportional to 21,912.40, 32,868.60 and 7,121.80 is: 10,682.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,912.40 : 32,868.60 = 7,121.80 : x
  2. Step 2: Convert to fraction form
    21,912.40/32,868.60 = 7,121.80/x
  3. Step 3: Cross multiply
    21,912.40x = 32,868.60 × 7,121.80
  4. Step 4: Simplify right side
    21,912.40x = 234,083,595.48
  5. Step 5: Solve for x
    x = 234,083,595.48/21,912.40
  6. Step 6: Final answer
    x = 10,682.70

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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.