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Finding the Fourth Proportional to 174.12, 261.21 and 122.78

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Solution

The fourth proportional to 174.12, 261.21 and 122.78 is: 184.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.12 : 261.21 = 122.78 : x
  2. Step 2: Convert to fraction form
    174.12/261.21 = 122.78/x
  3. Step 3: Cross multiply
    174.12x = 261.21 × 122.78
  4. Step 4: Simplify right side
    174.12x = 32,070.06
  5. Step 5: Solve for x
    x = 32,070.06/174.12
  6. Step 6: Final answer
    x = 184.18

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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.