Home / 21,280.33-31,922.61-8,143.75

Finding the Fourth Proportional to 21,280.33, 31,922.61 and 8,143.75

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Solution

The fourth proportional to 21,280.33, 31,922.61 and 8,143.75 is: 12,216.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.33 : 31,922.61 = 8,143.75 : x
  2. Step 2: Convert to fraction form
    21,280.33/31,922.61 = 8,143.75/x
  3. Step 3: Cross multiply
    21,280.33x = 31,922.61 × 8,143.75
  4. Step 4: Simplify right side
    21,280.33x = 259,969,755.19
  5. Step 5: Solve for x
    x = 259,969,755.19/21,280.33
  6. Step 6: Final answer
    x = 12,216.43

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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.