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Finding the Fourth Proportional to 9,081.40, 13,622.10 and 7,987.90

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Solution

The fourth proportional to 9,081.40, 13,622.10 and 7,987.90 is: 11,981.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,081.40 : 13,622.10 = 7,987.90 : x
  2. Step 2: Convert to fraction form
    9,081.40/13,622.10 = 7,987.90/x
  3. Step 3: Cross multiply
    9,081.40x = 13,622.10 × 7,987.90
  4. Step 4: Simplify right side
    9,081.40x = 108,811,972.59
  5. Step 5: Solve for x
    x = 108,811,972.59/9,081.40
  6. Step 6: Final answer
    x = 11,981.85

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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.