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Finding the Fourth Proportional to 15,857.13, 21,882.55 and 8,687.18

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Solution

The fourth proportional to 15,857.13, 21,882.55 and 8,687.18 is: 11,988.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,857.13 : 21,882.55 = 8,687.18 : x
  2. Step 2: Convert to fraction form
    15,857.13/21,882.55 = 8,687.18/x
  3. Step 3: Cross multiply
    15,857.13x = 21,882.55 × 8,687.18
  4. Step 4: Simplify right side
    15,857.13x = 190,097,716.96
  5. Step 5: Solve for x
    x = 190,097,716.96/15,857.13
  6. Step 6: Final answer
    x = 11,988.16

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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.