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Finding the Fourth Proportional to 8,861.20, 13,266.20 and 7,939.60

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Solution

The fourth proportional to 8,861.20, 13,266.20 and 7,939.60 is: 11,886.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,861.20 : 13,266.20 = 7,939.60 : x
  2. Step 2: Convert to fraction form
    8,861.20/13,266.20 = 7,939.60/x
  3. Step 3: Cross multiply
    8,861.20x = 13,266.20 × 7,939.60
  4. Step 4: Simplify right side
    8,861.20x = 105,328,321.52
  5. Step 5: Solve for x
    x = 105,328,321.52/8,861.20
  6. Step 6: Final answer
    x = 11,886.46

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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.