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Finding the Fourth Proportional to 239.78, 359.30 and 162.78

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Solution

The fourth proportional to 239.78, 359.30 and 162.78 is: 243.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.78 : 359.30 = 162.78 : x
  2. Step 2: Convert to fraction form
    239.78/359.30 = 162.78/x
  3. Step 3: Cross multiply
    239.78x = 359.30 × 162.78
  4. Step 4: Simplify right side
    239.78x = 58,486.85
  5. Step 5: Solve for x
    x = 58,486.85/239.78
  6. Step 6: Final answer
    x = 243.92

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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.