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Finding the Fourth Proportional to 3,149.75, 4,345.11 and 1,890.20

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Solution

The fourth proportional to 3,149.75, 4,345.11 and 1,890.20 is: 2,607.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,149.75 : 4,345.11 = 1,890.20 : x
  2. Step 2: Convert to fraction form
    3,149.75/4,345.11 = 1,890.20/x
  3. Step 3: Cross multiply
    3,149.75x = 4,345.11 × 1,890.20
  4. Step 4: Simplify right side
    3,149.75x = 8,213,137.78
  5. Step 5: Solve for x
    x = 8,213,137.78/3,149.75
  6. Step 6: Final answer
    x = 2,607.55

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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.