Home / 78,186.28-107,943.30-51,375.72

Finding the Fourth Proportional to 78,186.28, 107,943.30 and 51,375.72

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Solution

The fourth proportional to 78,186.28, 107,943.30 and 51,375.72 is: 70,928.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,186.28 : 107,943.30 = 51,375.72 : x
  2. Step 2: Convert to fraction form
    78,186.28/107,943.30 = 51,375.72/x
  3. Step 3: Cross multiply
    78,186.28x = 107,943.30 × 51,375.72
  4. Step 4: Simplify right side
    78,186.28x = 5,545,664,756.68
  5. Step 5: Solve for x
    x = 5,545,664,756.68/78,186.28
  6. Step 6: Final answer
    x = 70,928.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.