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Finding the Fourth Proportional to 86,287.68, 129,431.61 and 27,128.52

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Solution

The fourth proportional to 86,287.68, 129,431.61 and 27,128.52 is: 40,692.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,287.68 : 129,431.61 = 27,128.52 : x
  2. Step 2: Convert to fraction form
    86,287.68/129,431.61 = 27,128.52/x
  3. Step 3: Cross multiply
    86,287.68x = 129,431.61 × 27,128.52
  4. Step 4: Simplify right side
    86,287.68x = 3,511,288,020.52
  5. Step 5: Solve for x
    x = 3,511,288,020.52/86,287.68
  6. Step 6: Final answer
    x = 40,692.81

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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.