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Finding the Fourth Proportional to 138,470.56, 191,153.16 and 81,101.92

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Solution

The fourth proportional to 138,470.56, 191,153.16 and 81,101.92 is: 111,958.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,470.56 : 191,153.16 = 81,101.92 : x
  2. Step 2: Convert to fraction form
    138,470.56/191,153.16 = 81,101.92/x
  3. Step 3: Cross multiply
    138,470.56x = 191,153.16 × 81,101.92
  4. Step 4: Simplify right side
    138,470.56x = 15,502,888,290.07
  5. Step 5: Solve for x
    x = 15,502,888,290.07/138,470.56
  6. Step 6: Final answer
    x = 111,958.01

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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.