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Finding the Fourth Proportional to 20,551.61, 28,361.25 and 11,120.18

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Solution

The fourth proportional to 20,551.61, 28,361.25 and 11,120.18 is: 15,345.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,551.61 : 28,361.25 = 11,120.18 : x
  2. Step 2: Convert to fraction form
    20,551.61/28,361.25 = 11,120.18/x
  3. Step 3: Cross multiply
    20,551.61x = 28,361.25 × 11,120.18
  4. Step 4: Simplify right side
    20,551.61x = 315,382,063.22
  5. Step 5: Solve for x
    x = 315,382,063.22/20,551.61
  6. Step 6: Final answer
    x = 15,345.86

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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.