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Finding the Fourth Proportional to 173.91, 239.91 and 111.72

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Solution

The fourth proportional to 173.91, 239.91 and 111.72 is: 154.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.91 : 239.91 = 111.72 : x
  2. Step 2: Convert to fraction form
    173.91/239.91 = 111.72/x
  3. Step 3: Cross multiply
    173.91x = 239.91 × 111.72
  4. Step 4: Simplify right side
    173.91x = 26,801.83
  5. Step 5: Solve for x
    x = 26,801.83/173.91
  6. Step 6: Final answer
    x = 154.11

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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.