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Finding the Fourth Proportional to 115,912.70, 173,869.05 and 87,919.10

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Solution

The fourth proportional to 115,912.70, 173,869.05 and 87,919.10 is: 131,878.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,912.70 : 173,869.05 = 87,919.10 : x
  2. Step 2: Convert to fraction form
    115,912.70/173,869.05 = 87,919.10/x
  3. Step 3: Cross multiply
    115,912.70x = 173,869.05 × 87,919.10
  4. Step 4: Simplify right side
    115,912.70x = 15,286,410,393.86
  5. Step 5: Solve for x
    x = 15,286,410,393.86/115,912.70
  6. Step 6: Final answer
    x = 131,878.65

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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.