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Finding the Fourth Proportional to 8,122.40, 12,169.20 and 5,040.80

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Solution

The fourth proportional to 8,122.40, 12,169.20 and 5,040.80 is: 7,552.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,122.40 : 12,169.20 = 5,040.80 : x
  2. Step 2: Convert to fraction form
    8,122.40/12,169.20 = 5,040.80/x
  3. Step 3: Cross multiply
    8,122.40x = 12,169.20 × 5,040.80
  4. Step 4: Simplify right side
    8,122.40x = 61,342,503.36
  5. Step 5: Solve for x
    x = 61,342,503.36/8,122.40
  6. Step 6: Final answer
    x = 7,552.26

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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.