Home / 21,260.10-31,902.30-8,121.90

Finding the Fourth Proportional to 21,260.10, 31,902.30 and 8,121.90

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Solution

The fourth proportional to 21,260.10, 31,902.30 and 8,121.90 is: 12,187.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,260.10 : 31,902.30 = 8,121.90 : x
  2. Step 2: Convert to fraction form
    21,260.10/31,902.30 = 8,121.90/x
  3. Step 3: Cross multiply
    21,260.10x = 31,902.30 × 8,121.90
  4. Step 4: Simplify right side
    21,260.10x = 259,107,290.37
  5. Step 5: Solve for x
    x = 259,107,290.37/21,260.10
  6. Step 6: Final answer
    x = 12,187.49

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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.