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Finding the Fourth Proportional to 87,728, 131,612.84 and 28,563.72

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Solution

The fourth proportional to 87,728, 131,612.84 and 28,563.72 is: 42,852.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,728 : 131,612.84 = 28,563.72 : x
  2. Step 2: Convert to fraction form
    87,728/131,612.84 = 28,563.72/x
  3. Step 3: Cross multiply
    87,728x = 131,612.84 × 28,563.72
  4. Step 4: Simplify right side
    87,728x = 3,759,352,310.16
  5. Step 5: Solve for x
    x = 3,759,352,310.16/87,728
  6. Step 6: Final answer
    x = 42,852.37

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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.