Home / 131,143.72-196,383.40-81,321.14

Finding the Fourth Proportional to 131,143.72, 196,383.40 and 81,321.14

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Solution

The fourth proportional to 131,143.72, 196,383.40 and 81,321.14 is: 121,775.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,143.72 : 196,383.40 = 81,321.14 : x
  2. Step 2: Convert to fraction form
    131,143.72/196,383.40 = 81,321.14/x
  3. Step 3: Cross multiply
    131,143.72x = 196,383.40 × 81,321.14
  4. Step 4: Simplify right side
    131,143.72x = 15,970,121,965.08
  5. Step 5: Solve for x
    x = 15,970,121,965.08/131,143.72
  6. Step 6: Final answer
    x = 121,775.73

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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.