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Finding the Fourth Proportional to 8,081.40, 12,122.10 and 5,122.20

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Solution

The fourth proportional to 8,081.40, 12,122.10 and 5,122.20 is: 7,683.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,081.40 : 12,122.10 = 5,122.20 : x
  2. Step 2: Convert to fraction form
    8,081.40/12,122.10 = 5,122.20/x
  3. Step 3: Cross multiply
    8,081.40x = 12,122.10 × 5,122.20
  4. Step 4: Simplify right side
    8,081.40x = 62,091,820.62
  5. Step 5: Solve for x
    x = 62,091,820.62/8,081.40
  6. Step 6: Final answer
    x = 7,683.30

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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.