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Finding the Fourth Proportional to 21,680, 29,918.40 and 11,744

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Solution

The fourth proportional to 21,680, 29,918.40 and 11,744 is: 16,206.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,680 : 29,918.40 = 11,744 : x
  2. Step 2: Convert to fraction form
    21,680/29,918.40 = 11,744/x
  3. Step 3: Cross multiply
    21,680x = 29,918.40 × 11,744
  4. Step 4: Simplify right side
    21,680x = 351,361,689.60
  5. Step 5: Solve for x
    x = 351,361,689.60/21,680
  6. Step 6: Final answer
    x = 16,206.72

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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.