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Finding the Fourth Proportional to 21,644.90, 29,869.92 and 12,213.44

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Solution

The fourth proportional to 21,644.90, 29,869.92 and 12,213.44 is: 16,854.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,644.90 : 29,869.92 = 12,213.44 : x
  2. Step 2: Convert to fraction form
    21,644.90/29,869.92 = 12,213.44/x
  3. Step 3: Cross multiply
    21,644.90x = 29,869.92 × 12,213.44
  4. Step 4: Simplify right side
    21,644.90x = 364,814,475.72
  5. Step 5: Solve for x
    x = 364,814,475.72/21,644.90
  6. Step 6: Final answer
    x = 16,854.52

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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.