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Finding the Fourth Proportional to 87,948.80, 131,728.80 and 72,396.80

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Solution

The fourth proportional to 87,948.80, 131,728.80 and 72,396.80 is: 108,435.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,948.80 : 131,728.80 = 72,396.80 : x
  2. Step 2: Convert to fraction form
    87,948.80/131,728.80 = 72,396.80/x
  3. Step 3: Cross multiply
    87,948.80x = 131,728.80 × 72,396.80
  4. Step 4: Simplify right side
    87,948.80x = 9,536,743,587.84
  5. Step 5: Solve for x
    x = 9,536,743,587.84/87,948.80
  6. Step 6: Final answer
    x = 108,435.18

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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.