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Finding the Fourth Proportional to 174.90, 261.90 and 129.18

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Solution

The fourth proportional to 174.90, 261.90 and 129.18 is: 193.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.90 : 261.90 = 129.18 : x
  2. Step 2: Convert to fraction form
    174.90/261.90 = 129.18/x
  3. Step 3: Cross multiply
    174.90x = 261.90 × 129.18
  4. Step 4: Simplify right side
    174.90x = 33,832.24
  5. Step 5: Solve for x
    x = 33,832.24/174.90
  6. Step 6: Final answer
    x = 193.44

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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.