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Finding the Fourth Proportional to 158,949, 219,378.78 and 91,881

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Solution

The fourth proportional to 158,949, 219,378.78 and 91,881 is: 126,812.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,949 : 219,378.78 = 91,881 : x
  2. Step 2: Convert to fraction form
    158,949/219,378.78 = 91,881/x
  3. Step 3: Cross multiply
    158,949x = 219,378.78 × 91,881
  4. Step 4: Simplify right side
    158,949x = 20,156,741,685.18
  5. Step 5: Solve for x
    x = 20,156,741,685.18/158,949
  6. Step 6: Final answer
    x = 126,812.64

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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.