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Finding the Fourth Proportional to 331.05, 496.65 and 157.74

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Solution

The fourth proportional to 331.05, 496.65 and 157.74 is: 236.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.05 : 496.65 = 157.74 : x
  2. Step 2: Convert to fraction form
    331.05/496.65 = 157.74/x
  3. Step 3: Cross multiply
    331.05x = 496.65 × 157.74
  4. Step 4: Simplify right side
    331.05x = 78,341.57
  5. Step 5: Solve for x
    x = 78,341.57/331.05
  6. Step 6: Final answer
    x = 236.65

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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.