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Finding the Fourth Proportional to 18,705.62, 25,790.41 and 11,980.19

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Solution

The fourth proportional to 18,705.62, 25,790.41 and 11,980.19 is: 16,517.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.62 : 25,790.41 = 11,980.19 : x
  2. Step 2: Convert to fraction form
    18,705.62/25,790.41 = 11,980.19/x
  3. Step 3: Cross multiply
    18,705.62x = 25,790.41 × 11,980.19
  4. Step 4: Simplify right side
    18,705.62x = 308,974,011.98
  5. Step 5: Solve for x
    x = 308,974,011.98/18,705.62
  6. Step 6: Final answer
    x = 16,517.71

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.