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Finding the Fourth Proportional to 138,522.75, 191,161.44 and 78,906.75

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Solution

The fourth proportional to 138,522.75, 191,161.44 and 78,906.75 is: 108,891.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,522.75 : 191,161.44 = 78,906.75 : x
  2. Step 2: Convert to fraction form
    138,522.75/191,161.44 = 78,906.75/x
  3. Step 3: Cross multiply
    138,522.75x = 191,161.44 × 78,906.75
  4. Step 4: Simplify right side
    138,522.75x = 15,083,927,955.72
  5. Step 5: Solve for x
    x = 15,083,927,955.72/138,522.75
  6. Step 6: Final answer
    x = 108,891.34

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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.