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Finding the Fourth Proportional to 20,978.33, 28,949.24 and 12,019.61

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Solution

The fourth proportional to 20,978.33, 28,949.24 and 12,019.61 is: 16,586.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.33 : 28,949.24 = 12,019.61 : x
  2. Step 2: Convert to fraction form
    20,978.33/28,949.24 = 12,019.61/x
  3. Step 3: Cross multiply
    20,978.33x = 28,949.24 × 12,019.61
  4. Step 4: Simplify right side
    20,978.33x = 347,958,677.02
  5. Step 5: Solve for x
    x = 347,958,677.02/20,978.33
  6. Step 6: Final answer
    x = 16,586.58

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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.