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Finding the Fourth Proportional to 86,620.26, 129,930.38 and 20,956.26

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Solution

The fourth proportional to 86,620.26, 129,930.38 and 20,956.26 is: 31,434.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,620.26 : 129,930.38 = 20,956.26 : x
  2. Step 2: Convert to fraction form
    86,620.26/129,930.38 = 20,956.26/x
  3. Step 3: Cross multiply
    86,620.26x = 129,930.38 × 20,956.26
  4. Step 4: Simplify right side
    86,620.26x = 2,722,854,825.18
  5. Step 5: Solve for x
    x = 2,722,854,825.18/86,620.26
  6. Step 6: Final answer
    x = 31,434.39

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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.