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Finding the Fourth Proportional to 8,666.40, 12,999.60 and 8,119.65

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Solution

The fourth proportional to 8,666.40, 12,999.60 and 8,119.65 is: 12,179.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,666.40 : 12,999.60 = 8,119.65 : x
  2. Step 2: Convert to fraction form
    8,666.40/12,999.60 = 8,119.65/x
  3. Step 3: Cross multiply
    8,666.40x = 12,999.60 × 8,119.65
  4. Step 4: Simplify right side
    8,666.40x = 105,552,202.14
  5. Step 5: Solve for x
    x = 105,552,202.14/8,666.40
  6. Step 6: Final answer
    x = 12,179.48

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Similar ratio
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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.