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Finding the Fourth Proportional to 239.92, 359.94 and 77.65

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Solution

The fourth proportional to 239.92, 359.94 and 77.65 is: 116.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.92 : 359.94 = 77.65 : x
  2. Step 2: Convert to fraction form
    239.92/359.94 = 77.65/x
  3. Step 3: Cross multiply
    239.92x = 359.94 × 77.65
  4. Step 4: Simplify right side
    239.92x = 27,949.34
  5. Step 5: Solve for x
    x = 27,949.34/239.92
  6. Step 6: Final answer
    x = 116.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.