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Finding the Fourth Proportional to 3,993.78, 5,505.70 and 2,811.18

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Solution

The fourth proportional to 3,993.78, 5,505.70 and 2,811.18 is: 3,875.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,993.78 : 5,505.70 = 2,811.18 : x
  2. Step 2: Convert to fraction form
    3,993.78/5,505.70 = 2,811.18/x
  3. Step 3: Cross multiply
    3,993.78x = 5,505.70 × 2,811.18
  4. Step 4: Simplify right side
    3,993.78x = 15,477,513.73
  5. Step 5: Solve for x
    x = 15,477,513.73/3,993.78
  6. Step 6: Final answer
    x = 3,875.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.