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Finding the Fourth Proportional to 21,687.81, 29,929.41 and 12,735.42

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Solution

The fourth proportional to 21,687.81, 29,929.41 and 12,735.42 is: 17,575.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,687.81 : 29,929.41 = 12,735.42 : x
  2. Step 2: Convert to fraction form
    21,687.81/29,929.41 = 12,735.42/x
  3. Step 3: Cross multiply
    21,687.81x = 29,929.41 × 12,735.42
  4. Step 4: Simplify right side
    21,687.81x = 381,163,606.70
  5. Step 5: Solve for x
    x = 381,163,606.70/21,687.81
  6. Step 6: Final answer
    x = 17,575.02

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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.