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Finding the Fourth Proportional to 18,639.93, 27,965.97 and 8,780.21

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Solution

The fourth proportional to 18,639.93, 27,965.97 and 8,780.21 is: 13,173.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,639.93 : 27,965.97 = 8,780.21 : x
  2. Step 2: Convert to fraction form
    18,639.93/27,965.97 = 8,780.21/x
  3. Step 3: Cross multiply
    18,639.93x = 27,965.97 × 8,780.21
  4. Step 4: Simplify right side
    18,639.93x = 245,546,949.62
  5. Step 5: Solve for x
    x = 245,546,949.62/18,639.93
  6. Step 6: Final answer
    x = 13,173.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.