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Finding the Fourth Proportional to 138,528.75, 191,169.72 and 78,912.75

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Solution

The fourth proportional to 138,528.75, 191,169.72 and 78,912.75 is: 108,899.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,528.75 : 191,169.72 = 78,912.75 : x
  2. Step 2: Convert to fraction form
    138,528.75/191,169.72 = 78,912.75/x
  3. Step 3: Cross multiply
    138,528.75x = 191,169.72 × 78,912.75
  4. Step 4: Simplify right side
    138,528.75x = 15,085,728,321.93
  5. Step 5: Solve for x
    x = 15,085,728,321.93/138,528.75
  6. Step 6: Final answer
    x = 108,899.62

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1.5x scale

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.