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Finding the Fourth Proportional to 239.42, 359.08 and 77.11

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Solution

The fourth proportional to 239.42, 359.08 and 77.11 is: 115.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.42 : 359.08 = 77.11 : x
  2. Step 2: Convert to fraction form
    239.42/359.08 = 77.11/x
  3. Step 3: Cross multiply
    239.42x = 359.08 × 77.11
  4. Step 4: Simplify right side
    239.42x = 27,688.66
  5. Step 5: Solve for x
    x = 27,688.66/239.42
  6. Step 6: Final answer
    x = 115.65

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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.