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Finding the Fourth Proportional to 7,991.67, 11,990.97 and 4,289.58

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Solution

The fourth proportional to 7,991.67, 11,990.97 and 4,289.58 is: 6,436.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.67 : 11,990.97 = 4,289.58 : x
  2. Step 2: Convert to fraction form
    7,991.67/11,990.97 = 4,289.58/x
  3. Step 3: Cross multiply
    7,991.67x = 11,990.97 × 4,289.58
  4. Step 4: Simplify right side
    7,991.67x = 51,436,209.01
  5. Step 5: Solve for x
    x = 51,436,209.01/7,991.67
  6. Step 6: Final answer
    x = 6,436.22

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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.