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Finding the Fourth Proportional to 20,409.15, 28,167.71 and 12,455.99

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Solution

The fourth proportional to 20,409.15, 28,167.71 and 12,455.99 is: 17,191.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,409.15 : 28,167.71 = 12,455.99 : x
  2. Step 2: Convert to fraction form
    20,409.15/28,167.71 = 12,455.99/x
  3. Step 3: Cross multiply
    20,409.15x = 28,167.71 × 12,455.99
  4. Step 4: Simplify right side
    20,409.15x = 350,856,664.96
  5. Step 5: Solve for x
    x = 350,856,664.96/20,409.15
  6. Step 6: Final answer
    x = 17,191.14

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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.