Home / 131,138.72-196,375.91-81,316.13

Finding the Fourth Proportional to 131,138.72, 196,375.91 and 81,316.13

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Solution

The fourth proportional to 131,138.72, 196,375.91 and 81,316.13 is: 121,768.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,138.72 : 196,375.91 = 81,316.13 : x
  2. Step 2: Convert to fraction form
    131,138.72/196,375.91 = 81,316.13/x
  3. Step 3: Cross multiply
    131,138.72x = 196,375.91 × 81,316.13
  4. Step 4: Simplify right side
    131,138.72x = 15,968,527,637.97
  5. Step 5: Solve for x
    x = 15,968,527,637.97/131,138.72
  6. Step 6: Final answer
    x = 121,768.21

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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.