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Finding the Fourth Proportional to 3,455.72, 5,183.12 and 2,139.72

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Solution

The fourth proportional to 3,455.72, 5,183.12 and 2,139.72 is: 3,209.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,455.72 : 5,183.12 = 2,139.72 : x
  2. Step 2: Convert to fraction form
    3,455.72/5,183.12 = 2,139.72/x
  3. Step 3: Cross multiply
    3,455.72x = 5,183.12 × 2,139.72
  4. Step 4: Simplify right side
    3,455.72x = 11,090,414.83
  5. Step 5: Solve for x
    x = 11,090,414.83/3,455.72
  6. Step 6: Final answer
    x = 3,209.30

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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.