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Finding the Fourth Proportional to 262.74, 393.93 and 159.78

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Solution

The fourth proportional to 262.74, 393.93 and 159.78 is: 239.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.74 : 393.93 = 159.78 : x
  2. Step 2: Convert to fraction form
    262.74/393.93 = 159.78/x
  3. Step 3: Cross multiply
    262.74x = 393.93 × 159.78
  4. Step 4: Simplify right side
    262.74x = 62,942.14
  5. Step 5: Solve for x
    x = 62,942.14/262.74
  6. Step 6: Final answer
    x = 239.56

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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.