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Finding the Fourth Proportional to 138,479.40, 191,100.60 and 81,889.56

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Solution

The fourth proportional to 138,479.40, 191,100.60 and 81,889.56 is: 113,007.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,479.40 : 191,100.60 = 81,889.56 : x
  2. Step 2: Convert to fraction form
    138,479.40/191,100.60 = 81,889.56/x
  3. Step 3: Cross multiply
    138,479.40x = 191,100.60 × 81,889.56
  4. Step 4: Simplify right side
    138,479.40x = 15,649,144,049.74
  5. Step 5: Solve for x
    x = 15,649,144,049.74/138,479.40
  6. Step 6: Final answer
    x = 113,007.02

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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.