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Finding the Fourth Proportional to 86,290.60, 129,435.81 and 27,131.44

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Solution

The fourth proportional to 86,290.60, 129,435.81 and 27,131.44 is: 40,697.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,290.60 : 129,435.81 = 27,131.44 : x
  2. Step 2: Convert to fraction form
    86,290.60/129,435.81 = 27,131.44/x
  3. Step 3: Cross multiply
    86,290.60x = 129,435.81 × 27,131.44
  4. Step 4: Simplify right side
    86,290.60x = 3,511,779,912.87
  5. Step 5: Solve for x
    x = 3,511,779,912.87/86,290.60
  6. Step 6: Final answer
    x = 40,697.13

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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.