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Finding the Fourth Proportional to 80,336.73, 119,786.85 and 78,129.75

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Solution

The fourth proportional to 80,336.73, 119,786.85 and 78,129.75 is: 116,496.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,336.73 : 119,786.85 = 78,129.75 : x
  2. Step 2: Convert to fraction form
    80,336.73/119,786.85 = 78,129.75/x
  3. Step 3: Cross multiply
    80,336.73x = 119,786.85 × 78,129.75
  4. Step 4: Simplify right side
    80,336.73x = 9,358,916,643.79
  5. Step 5: Solve for x
    x = 9,358,916,643.79/80,336.73
  6. Step 6: Final answer
    x = 116,496.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.