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Finding the Fourth Proportional to 21,611.88, 29,827.08 and 12,662.80

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Solution

The fourth proportional to 21,611.88, 29,827.08 and 12,662.80 is: 17,476.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,611.88 : 29,827.08 = 12,662.80 : x
  2. Step 2: Convert to fraction form
    21,611.88/29,827.08 = 12,662.80/x
  3. Step 3: Cross multiply
    21,611.88x = 29,827.08 × 12,662.80
  4. Step 4: Simplify right side
    21,611.88x = 377,694,348.62
  5. Step 5: Solve for x
    x = 377,694,348.62/21,611.88
  6. Step 6: Final answer
    x = 17,476.24

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1.5x scale

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.