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Finding the Fourth Proportional to 21,644.97, 29,870.01 and 12,213.47

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Solution

The fourth proportional to 21,644.97, 29,870.01 and 12,213.47 is: 16,854.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,644.97 : 29,870.01 = 12,213.47 : x
  2. Step 2: Convert to fraction form
    21,644.97/29,870.01 = 12,213.47/x
  3. Step 3: Cross multiply
    21,644.97x = 29,870.01 × 12,213.47
  4. Step 4: Simplify right side
    21,644.97x = 364,816,321.68
  5. Step 5: Solve for x
    x = 364,816,321.68/21,644.97
  6. Step 6: Final answer
    x = 16,854.55

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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.