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Finding the Fourth Proportional to 87,435.20, 131,185.20 and 28,272.80

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Solution

The fourth proportional to 87,435.20, 131,185.20 and 28,272.80 is: 42,419.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,435.20 : 131,185.20 = 28,272.80 : x
  2. Step 2: Convert to fraction form
    87,435.20/131,185.20 = 28,272.80/x
  3. Step 3: Cross multiply
    87,435.20x = 131,185.20 × 28,272.80
  4. Step 4: Simplify right side
    87,435.20x = 3,708,972,922.56
  5. Step 5: Solve for x
    x = 3,708,972,922.56/87,435.20
  6. Step 6: Final answer
    x = 42,419.68

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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.