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Finding the Fourth Proportional to 21,286.97, 29,376.93 and 11,855.53

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Solution

The fourth proportional to 21,286.97, 29,376.93 and 11,855.53 is: 16,361.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,286.97 : 29,376.93 = 11,855.53 : x
  2. Step 2: Convert to fraction form
    21,286.97/29,376.93 = 11,855.53/x
  3. Step 3: Cross multiply
    21,286.97x = 29,376.93 × 11,855.53
  4. Step 4: Simplify right side
    21,286.97x = 348,279,089.41
  5. Step 5: Solve for x
    x = 348,279,089.41/21,286.97
  6. Step 6: Final answer
    x = 16,361.14

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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.