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Finding the Fourth Proportional to 18,716.62, 25,770 and 15,878.11

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Solution

The fourth proportional to 18,716.62, 25,770 and 15,878.11 is: 21,861.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,716.62 : 25,770 = 15,878.11 : x
  2. Step 2: Convert to fraction form
    18,716.62/25,770 = 15,878.11/x
  3. Step 3: Cross multiply
    18,716.62x = 25,770 × 15,878.11
  4. Step 4: Simplify right side
    18,716.62x = 409,178,894.70
  5. Step 5: Solve for x
    x = 409,178,894.70/18,716.62
  6. Step 6: Final answer
    x = 21,861.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.