Home / 21,129.43-31,692.33-12,806.99

Finding the Fourth Proportional to 21,129.43, 31,692.33 and 12,806.99

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Solution

The fourth proportional to 21,129.43, 31,692.33 and 12,806.99 is: 19,209.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.43 : 31,692.33 = 12,806.99 : x
  2. Step 2: Convert to fraction form
    21,129.43/31,692.33 = 12,806.99/x
  3. Step 3: Cross multiply
    21,129.43x = 31,692.33 × 12,806.99
  4. Step 4: Simplify right side
    21,129.43x = 405,883,353.39
  5. Step 5: Solve for x
    x = 405,883,353.39/21,129.43
  6. Step 6: Final answer
    x = 19,209.38

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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.