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Finding the Fourth Proportional to 20,487.87, 28,270.92 and 11,535.14

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Solution

The fourth proportional to 20,487.87, 28,270.92 and 11,535.14 is: 15,917.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.87 : 28,270.92 = 11,535.14 : x
  2. Step 2: Convert to fraction form
    20,487.87/28,270.92 = 11,535.14/x
  3. Step 3: Cross multiply
    20,487.87x = 28,270.92 × 11,535.14
  4. Step 4: Simplify right side
    20,487.87x = 326,109,134.06
  5. Step 5: Solve for x
    x = 326,109,134.06/20,487.87
  6. Step 6: Final answer
    x = 15,917.18

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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.