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Finding the Fourth Proportional to 21,687, 29,928.08 and 11,751

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Solution

The fourth proportional to 21,687, 29,928.08 and 11,751 is: 16,216.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,687 : 29,928.08 = 11,751 : x
  2. Step 2: Convert to fraction form
    21,687/29,928.08 = 11,751/x
  3. Step 3: Cross multiply
    21,687x = 29,928.08 × 11,751
  4. Step 4: Simplify right side
    21,687x = 351,684,868.08
  5. Step 5: Solve for x
    x = 351,684,868.08/21,687
  6. Step 6: Final answer
    x = 16,216.39

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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.