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Finding the Fourth Proportional to 86,064.26, 128,231.37 and 81,229.81

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Solution

The fourth proportional to 86,064.26, 128,231.37 and 81,229.81 is: 121,028.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,064.26 : 128,231.37 = 81,229.81 : x
  2. Step 2: Convert to fraction form
    86,064.26/128,231.37 = 81,229.81/x
  3. Step 3: Cross multiply
    86,064.26x = 128,231.37 × 81,229.81
  4. Step 4: Simplify right side
    86,064.26x = 10,416,209,758.96
  5. Step 5: Solve for x
    x = 10,416,209,758.96/86,064.26
  6. Step 6: Final answer
    x = 121,028.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.