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Finding the Fourth Proportional to 86,361.21, 129,579.49 and 30,241.60

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Solution

The fourth proportional to 86,361.21, 129,579.49 and 30,241.60 is: 45,375.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,361.21 : 129,579.49 = 30,241.60 : x
  2. Step 2: Convert to fraction form
    86,361.21/129,579.49 = 30,241.60/x
  3. Step 3: Cross multiply
    86,361.21x = 129,579.49 × 30,241.60
  4. Step 4: Simplify right side
    86,361.21x = 3,918,690,801.95
  5. Step 5: Solve for x
    x = 3,918,690,801.95/86,361.21
  6. Step 6: Final answer
    x = 45,375.59

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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.