Home / 21,138.08-31,684.23-13,747.84

Finding the Fourth Proportional to 21,138.08, 31,684.23 and 13,747.84

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Solution

The fourth proportional to 21,138.08, 31,684.23 and 13,747.84 is: 20,606.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.08 : 31,684.23 = 13,747.84 : x
  2. Step 2: Convert to fraction form
    21,138.08/31,684.23 = 13,747.84/x
  3. Step 3: Cross multiply
    21,138.08x = 31,684.23 × 13,747.84
  4. Step 4: Simplify right side
    21,138.08x = 435,589,645.35
  5. Step 5: Solve for x
    x = 435,589,645.35/21,138.08
  6. Step 6: Final answer
    x = 20,606.87

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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.