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Finding the Fourth Proportional to 260.40, 391.38 and 174.02

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Solution

The fourth proportional to 260.40, 391.38 and 174.02 is: 261.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.40 : 391.38 = 174.02 : x
  2. Step 2: Convert to fraction form
    260.40/391.38 = 174.02/x
  3. Step 3: Cross multiply
    260.40x = 391.38 × 174.02
  4. Step 4: Simplify right side
    260.40x = 68,107.95
  5. Step 5: Solve for x
    x = 68,107.95/260.40
  6. Step 6: Final answer
    x = 261.55

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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.