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Finding the Fourth Proportional to 138,608.52, 191,278.83 and 78,179.67

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Solution

The fourth proportional to 138,608.52, 191,278.83 and 78,179.67 is: 107,887.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,608.52 : 191,278.83 = 78,179.67 : x
  2. Step 2: Convert to fraction form
    138,608.52/191,278.83 = 78,179.67/x
  3. Step 3: Cross multiply
    138,608.52x = 191,278.83 × 78,179.67
  4. Step 4: Simplify right side
    138,608.52x = 14,954,115,807.39
  5. Step 5: Solve for x
    x = 14,954,115,807.39/138,608.52
  6. Step 6: Final answer
    x = 107,887.42

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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.