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Finding the Fourth Proportional to 174.49, 261.17 and 128.82

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Solution

The fourth proportional to 174.49, 261.17 and 128.82 is: 192.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.49 : 261.17 = 128.82 : x
  2. Step 2: Convert to fraction form
    174.49/261.17 = 128.82/x
  3. Step 3: Cross multiply
    174.49x = 261.17 × 128.82
  4. Step 4: Simplify right side
    174.49x = 33,643.92
  5. Step 5: Solve for x
    x = 33,643.92/174.49
  6. Step 6: Final answer
    x = 192.81

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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.