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Finding the Fourth Proportional to 21,651.95, 29,879.12 and 12,220.44

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Solution

The fourth proportional to 21,651.95, 29,879.12 and 12,220.44 is: 16,863.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,651.95 : 29,879.12 = 12,220.44 : x
  2. Step 2: Convert to fraction form
    21,651.95/29,879.12 = 12,220.44/x
  3. Step 3: Cross multiply
    21,651.95x = 29,879.12 × 12,220.44
  4. Step 4: Simplify right side
    21,651.95x = 365,135,932.11
  5. Step 5: Solve for x
    x = 365,135,932.11/21,651.95
  6. Step 6: Final answer
    x = 16,863.89

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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.