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Finding the Fourth Proportional to 7,990.99, 11,986.48 and 2,147.60

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Solution

The fourth proportional to 7,990.99, 11,986.48 and 2,147.60 is: 3,221.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,990.99 : 11,986.48 = 2,147.60 : x
  2. Step 2: Convert to fraction form
    7,990.99/11,986.48 = 2,147.60/x
  3. Step 3: Cross multiply
    7,990.99x = 11,986.48 × 2,147.60
  4. Step 4: Simplify right side
    7,990.99x = 25,742,164.45
  5. Step 5: Solve for x
    x = 25,742,164.45/7,990.99
  6. Step 6: Final answer
    x = 3,221.40

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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.