Home / 21,253.07-31,880.21-12,481.98

Finding the Fourth Proportional to 21,253.07, 31,880.21 and 12,481.98

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Solution

The fourth proportional to 21,253.07, 31,880.21 and 12,481.98 is: 18,723.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,253.07 : 31,880.21 = 12,481.98 : x
  2. Step 2: Convert to fraction form
    21,253.07/31,880.21 = 12,481.98/x
  3. Step 3: Cross multiply
    21,253.07x = 31,880.21 × 12,481.98
  4. Step 4: Simplify right side
    21,253.07x = 397,928,081.21
  5. Step 5: Solve for x
    x = 397,928,081.21/21,253.07
  6. Step 6: Final answer
    x = 18,723.33

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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.