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Finding the Fourth Proportional to 21,277, 29,362.26 and 12,891.88

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Solution

The fourth proportional to 21,277, 29,362.26 and 12,891.88 is: 17,790.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,277 : 29,362.26 = 12,891.88 : x
  2. Step 2: Convert to fraction form
    21,277/29,362.26 = 12,891.88/x
  3. Step 3: Cross multiply
    21,277x = 29,362.26 × 12,891.88
  4. Step 4: Simplify right side
    21,277x = 378,534,732.45
  5. Step 5: Solve for x
    x = 378,534,732.45/21,277
  6. Step 6: Final answer
    x = 17,790.79

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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.