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Finding the Fourth Proportional to 8,140.80, 12,211.60 and 4,252.80

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Solution

The fourth proportional to 8,140.80, 12,211.60 and 4,252.80 is: 6,379.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,140.80 : 12,211.60 = 4,252.80 : x
  2. Step 2: Convert to fraction form
    8,140.80/12,211.60 = 4,252.80/x
  3. Step 3: Cross multiply
    8,140.80x = 12,211.60 × 4,252.80
  4. Step 4: Simplify right side
    8,140.80x = 51,933,492.48
  5. Step 5: Solve for x
    x = 51,933,492.48/8,140.80
  6. Step 6: Final answer
    x = 6,379.41

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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.