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Finding the Fourth Proportional to 171.96, 258.06 and 75.78

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Solution

The fourth proportional to 171.96, 258.06 and 75.78 is: 113.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.96 : 258.06 = 75.78 : x
  2. Step 2: Convert to fraction form
    171.96/258.06 = 75.78/x
  3. Step 3: Cross multiply
    171.96x = 258.06 × 75.78
  4. Step 4: Simplify right side
    171.96x = 19,555.79
  5. Step 5: Solve for x
    x = 19,555.79/171.96
  6. Step 6: Final answer
    x = 113.72

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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.