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Finding the Fourth Proportional to 15,805.41, 21,812.13 and 9,091.05

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Solution

The fourth proportional to 15,805.41, 21,812.13 and 9,091.05 is: 12,546.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,805.41 : 21,812.13 = 9,091.05 : x
  2. Step 2: Convert to fraction form
    15,805.41/21,812.13 = 9,091.05/x
  3. Step 3: Cross multiply
    15,805.41x = 21,812.13 × 9,091.05
  4. Step 4: Simplify right side
    15,805.41x = 198,295,164.44
  5. Step 5: Solve for x
    x = 198,295,164.44/15,805.41
  6. Step 6: Final answer
    x = 12,546.03

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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.