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Finding the Fourth Proportional to 174.38, 261.09 and 139.95

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Solution

The fourth proportional to 174.38, 261.09 and 139.95 is: 209.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.38 : 261.09 = 139.95 : x
  2. Step 2: Convert to fraction form
    174.38/261.09 = 139.95/x
  3. Step 3: Cross multiply
    174.38x = 261.09 × 139.95
  4. Step 4: Simplify right side
    174.38x = 36,539.55
  5. Step 5: Solve for x
    x = 36,539.55/174.38
  6. Step 6: Final answer
    x = 209.55

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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.