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Finding the Fourth Proportional to 20,761.40, 31,142.09 and 6,910.40

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Solution

The fourth proportional to 20,761.40, 31,142.09 and 6,910.40 is: 10,365.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761.40 : 31,142.09 = 6,910.40 : x
  2. Step 2: Convert to fraction form
    20,761.40/31,142.09 = 6,910.40/x
  3. Step 3: Cross multiply
    20,761.40x = 31,142.09 × 6,910.40
  4. Step 4: Simplify right side
    20,761.40x = 215,204,264.18
  5. Step 5: Solve for x
    x = 215,204,264.18/20,761.40
  6. Step 6: Final answer
    x = 10,365.60

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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.