Home / 21,286.43-31,931.56-8,138.91

Finding the Fourth Proportional to 21,286.43, 31,931.56 and 8,138.91

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Solution

The fourth proportional to 21,286.43, 31,931.56 and 8,138.91 is: 12,209.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,286.43 : 31,931.56 = 8,138.91 : x
  2. Step 2: Convert to fraction form
    21,286.43/31,931.56 = 8,138.91/x
  3. Step 3: Cross multiply
    21,286.43x = 31,931.56 × 8,138.91
  4. Step 4: Simplify right side
    21,286.43x = 259,888,093.00
  5. Step 5: Solve for x
    x = 259,888,093.00/21,286.43
  6. Step 6: Final answer
    x = 12,209.10

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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.