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Finding the Fourth Proportional to 21,339.40, 29,447.46 and 11,907.88

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Solution

The fourth proportional to 21,339.40, 29,447.46 and 11,907.88 is: 16,432.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,339.40 : 29,447.46 = 11,907.88 : x
  2. Step 2: Convert to fraction form
    21,339.40/29,447.46 = 11,907.88/x
  3. Step 3: Cross multiply
    21,339.40x = 29,447.46 × 11,907.88
  4. Step 4: Simplify right side
    21,339.40x = 350,656,819.98
  5. Step 5: Solve for x
    x = 350,656,819.98/21,339.40
  6. Step 6: Final answer
    x = 16,432.37

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.