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Finding the Fourth Proportional to 9,380.90, 12,945.20 and 5,131.90

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Solution

The fourth proportional to 9,380.90, 12,945.20 and 5,131.90 is: 7,081.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,380.90 : 12,945.20 = 5,131.90 : x
  2. Step 2: Convert to fraction form
    9,380.90/12,945.20 = 5,131.90/x
  3. Step 3: Cross multiply
    9,380.90x = 12,945.20 × 5,131.90
  4. Step 4: Simplify right side
    9,380.90x = 66,433,471.88
  5. Step 5: Solve for x
    x = 66,433,471.88/9,380.90
  6. Step 6: Final answer
    x = 7,081.78

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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.