Home / 131,140.72-196,378.90-81,318.13

Finding the Fourth Proportional to 131,140.72, 196,378.90 and 81,318.13

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Solution

The fourth proportional to 131,140.72, 196,378.90 and 81,318.13 is: 121,771.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,140.72 : 196,378.90 = 81,318.13 : x
  2. Step 2: Convert to fraction form
    131,140.72/196,378.90 = 81,318.13/x
  3. Step 3: Cross multiply
    131,140.72x = 196,378.90 × 81,318.13
  4. Step 4: Simplify right side
    131,140.72x = 15,969,164,919.46
  5. Step 5: Solve for x
    x = 15,969,164,919.46/131,140.72
  6. Step 6: Final answer
    x = 121,771.22

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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.