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Finding the Fourth Proportional to 20,380.31, 28,129.83 and 12,426.92

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Solution

The fourth proportional to 20,380.31, 28,129.83 and 12,426.92 is: 17,152.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.31 : 28,129.83 = 12,426.92 : x
  2. Step 2: Convert to fraction form
    20,380.31/28,129.83 = 12,426.92/x
  3. Step 3: Cross multiply
    20,380.31x = 28,129.83 × 12,426.92
  4. Step 4: Simplify right side
    20,380.31x = 349,567,147.02
  5. Step 5: Solve for x
    x = 349,567,147.02/20,380.31
  6. Step 6: Final answer
    x = 17,152.20

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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.