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Finding the Fourth Proportional to 159,405.39, 219,971.03 and 91,418.85

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Solution

The fourth proportional to 159,405.39, 219,971.03 and 91,418.85 is: 126,153.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,405.39 : 219,971.03 = 91,418.85 : x
  2. Step 2: Convert to fraction form
    159,405.39/219,971.03 = 91,418.85/x
  3. Step 3: Cross multiply
    159,405.39x = 219,971.03 × 91,418.85
  4. Step 4: Simplify right side
    159,405.39x = 20,109,498,138.82
  5. Step 5: Solve for x
    x = 20,109,498,138.82/159,405.39
  6. Step 6: Final answer
    x = 126,153.19

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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.