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Finding the Fourth Proportional to 8,720.82, 13,081.23 and 2,147.12

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Solution

The fourth proportional to 8,720.82, 13,081.23 and 2,147.12 is: 3,220.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.82 : 13,081.23 = 2,147.12 : x
  2. Step 2: Convert to fraction form
    8,720.82/13,081.23 = 2,147.12/x
  3. Step 3: Cross multiply
    8,720.82x = 13,081.23 × 2,147.12
  4. Step 4: Simplify right side
    8,720.82x = 28,086,970.56
  5. Step 5: Solve for x
    x = 28,086,970.56/8,720.82
  6. Step 6: Final answer
    x = 3,220.68

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.