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Finding the Fourth Proportional to 87,718.40, 131,707.20 and 68,019.20

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Solution

The fourth proportional to 87,718.40, 131,707.20 and 68,019.20 is: 102,129.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,718.40 : 131,707.20 = 68,019.20 : x
  2. Step 2: Convert to fraction form
    87,718.40/131,707.20 = 68,019.20/x
  3. Step 3: Cross multiply
    87,718.40x = 131,707.20 × 68,019.20
  4. Step 4: Simplify right side
    87,718.40x = 8,958,618,378.24
  5. Step 5: Solve for x
    x = 8,958,618,378.24/87,718.40
  6. Step 6: Final answer
    x = 102,129.30

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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.