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Finding the Fourth Proportional to 174.45, 261.74 and 71.78

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Solution

The fourth proportional to 174.45, 261.74 and 71.78 is: 107.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.45 : 261.74 = 71.78 : x
  2. Step 2: Convert to fraction form
    174.45/261.74 = 71.78/x
  3. Step 3: Cross multiply
    174.45x = 261.74 × 71.78
  4. Step 4: Simplify right side
    174.45x = 18,787.34
  5. Step 5: Solve for x
    x = 18,787.34/174.45
  6. Step 6: Final answer
    x = 107.70

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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.