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Finding the Fourth Proportional to 7,990.90, 11,986.37 and 7,979.37

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Solution

The fourth proportional to 7,990.90, 11,986.37 and 7,979.37 is: 11,969.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,990.90 : 11,986.37 = 7,979.37 : x
  2. Step 2: Convert to fraction form
    7,990.90/11,986.37 = 7,979.37/x
  3. Step 3: Cross multiply
    7,990.90x = 11,986.37 × 7,979.37
  4. Step 4: Simplify right side
    7,990.90x = 95,643,681.19
  5. Step 5: Solve for x
    x = 95,643,681.19/7,990.90
  6. Step 6: Final answer
    x = 11,969.07

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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.