Home / 21,121.59-31,679.96-5,540.43

Finding the Fourth Proportional to 21,121.59, 31,679.96 and 5,540.43

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Solution

The fourth proportional to 21,121.59, 31,679.96 and 5,540.43 is: 8,310.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.59 : 31,679.96 = 5,540.43 : x
  2. Step 2: Convert to fraction form
    21,121.59/31,679.96 = 5,540.43/x
  3. Step 3: Cross multiply
    21,121.59x = 31,679.96 × 5,540.43
  4. Step 4: Simplify right side
    21,121.59x = 175,520,573.08
  5. Step 5: Solve for x
    x = 175,520,573.08/21,121.59
  6. Step 6: Final answer
    x = 8,310.01

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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.