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Finding the Fourth Proportional to 20,801.25, 28,705.91 and 11,369.81

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Solution

The fourth proportional to 20,801.25, 28,705.91 and 11,369.81 is: 15,690.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,801.25 : 28,705.91 = 11,369.81 : x
  2. Step 2: Convert to fraction form
    20,801.25/28,705.91 = 11,369.81/x
  3. Step 3: Cross multiply
    20,801.25x = 28,705.91 × 11,369.81
  4. Step 4: Simplify right side
    20,801.25x = 326,380,757.49
  5. Step 5: Solve for x
    x = 326,380,757.49/20,801.25
  6. Step 6: Final answer
    x = 15,690.44

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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.