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Finding the Fourth Proportional to 86,425.62, 129,638.44 and 20,761.62

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Solution

The fourth proportional to 86,425.62, 129,638.44 and 20,761.62 is: 31,142.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,425.62 : 129,638.44 = 20,761.62 : x
  2. Step 2: Convert to fraction form
    86,425.62/129,638.44 = 20,761.62/x
  3. Step 3: Cross multiply
    86,425.62x = 129,638.44 × 20,761.62
  4. Step 4: Simplify right side
    86,425.62x = 2,691,504,028.67
  5. Step 5: Solve for x
    x = 2,691,504,028.67/86,425.62
  6. Step 6: Final answer
    x = 31,142.43

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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.