Home / 21,639.80-29,863.14-12,692.60

Finding the Fourth Proportional to 21,639.80, 29,863.14 and 12,692.60

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Solution

The fourth proportional to 21,639.80, 29,863.14 and 12,692.60 is: 17,515.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,639.80 : 29,863.14 = 12,692.60 : x
  2. Step 2: Convert to fraction form
    21,639.80/29,863.14 = 12,692.60/x
  3. Step 3: Cross multiply
    21,639.80x = 29,863.14 × 12,692.60
  4. Step 4: Simplify right side
    21,639.80x = 379,040,890.76
  5. Step 5: Solve for x
    x = 379,040,890.76/21,639.80
  6. Step 6: Final answer
    x = 17,515.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.