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Finding the Fourth Proportional to 2,790.05, 4,183.98 and 815.01

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Solution

The fourth proportional to 2,790.05, 4,183.98 and 815.01 is: 1,222.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,790.05 : 4,183.98 = 815.01 : x
  2. Step 2: Convert to fraction form
    2,790.05/4,183.98 = 815.01/x
  3. Step 3: Cross multiply
    2,790.05x = 4,183.98 × 815.01
  4. Step 4: Simplify right side
    2,790.05x = 3,409,985.54
  5. Step 5: Solve for x
    x = 3,409,985.54/2,790.05
  6. Step 6: Final answer
    x = 1,222.20

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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.