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Finding the Fourth Proportional to 21,640.03, 29,863.62 and 12,693.98

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Solution

The fourth proportional to 21,640.03, 29,863.62 and 12,693.98 is: 17,517.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,640.03 : 29,863.62 = 12,693.98 : x
  2. Step 2: Convert to fraction form
    21,640.03/29,863.62 = 12,693.98/x
  3. Step 3: Cross multiply
    21,640.03x = 29,863.62 × 12,693.98
  4. Step 4: Simplify right side
    21,640.03x = 379,088,195.01
  5. Step 5: Solve for x
    x = 379,088,195.01/21,640.03
  6. Step 6: Final answer
    x = 17,517.91

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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.