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Finding the Fourth Proportional to 173.74, 239.78 and 103.81

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Solution

The fourth proportional to 173.74, 239.78 and 103.81 is: 143.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.74 : 239.78 = 103.81 : x
  2. Step 2: Convert to fraction form
    173.74/239.78 = 103.81/x
  3. Step 3: Cross multiply
    173.74x = 239.78 × 103.81
  4. Step 4: Simplify right side
    173.74x = 24,891.56
  5. Step 5: Solve for x
    x = 24,891.56/173.74
  6. Step 6: Final answer
    x = 143.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.