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Finding the Fourth Proportional to 7,991.78, 11,990.55 and 2,799.14

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Solution

The fourth proportional to 7,991.78, 11,990.55 and 2,799.14 is: 4,199.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.78 : 11,990.55 = 2,799.14 : x
  2. Step 2: Convert to fraction form
    7,991.78/11,990.55 = 2,799.14/x
  3. Step 3: Cross multiply
    7,991.78x = 11,990.55 × 2,799.14
  4. Step 4: Simplify right side
    7,991.78x = 33,563,228.13
  5. Step 5: Solve for x
    x = 33,563,228.13/7,991.78
  6. Step 6: Final answer
    x = 4,199.72

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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.