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Finding the Fourth Proportional to 2,990.87, 4,485.97 and 799.77

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Solution

The fourth proportional to 2,990.87, 4,485.97 and 799.77 is: 1,199.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.87 : 4,485.97 = 799.77 : x
  2. Step 2: Convert to fraction form
    2,990.87/4,485.97 = 799.77/x
  3. Step 3: Cross multiply
    2,990.87x = 4,485.97 × 799.77
  4. Step 4: Simplify right side
    2,990.87x = 3,587,747.60
  5. Step 5: Solve for x
    x = 3,587,747.60/2,990.87
  6. Step 6: Final answer
    x = 1,199.57

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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.