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Finding the Fourth Proportional to 8,115.75, 11,199.78 and 4,389.75

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Solution

The fourth proportional to 8,115.75, 11,199.78 and 4,389.75 is: 6,057.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,115.75 : 11,199.78 = 4,389.75 : x
  2. Step 2: Convert to fraction form
    8,115.75/11,199.78 = 4,389.75/x
  3. Step 3: Cross multiply
    8,115.75x = 11,199.78 × 4,389.75
  4. Step 4: Simplify right side
    8,115.75x = 49,164,234.26
  5. Step 5: Solve for x
    x = 49,164,234.26/8,115.75
  6. Step 6: Final answer
    x = 6,057.88

Related Problems

Find fourth proportional to 4,057.88, 5,599.89 and 2,194.88
Half scale
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Double scale
Find fourth proportional to 8,116.75, 11,201.16 and 4,390.75
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.