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Finding the Fourth Proportional to 20,640.90, 30,961.34 and 8,320.26

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Solution

The fourth proportional to 20,640.90, 30,961.34 and 8,320.26 is: 12,480.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.90 : 30,961.34 = 8,320.26 : x
  2. Step 2: Convert to fraction form
    20,640.90/30,961.34 = 8,320.26/x
  3. Step 3: Cross multiply
    20,640.90x = 30,961.34 × 8,320.26
  4. Step 4: Simplify right side
    20,640.90x = 257,606,398.75
  5. Step 5: Solve for x
    x = 257,606,398.75/20,640.90
  6. Step 6: Final answer
    x = 12,480.39

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Similar ratio
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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.