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Finding the Fourth Proportional to 331.12, 492.94 and 326.56

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Solution

The fourth proportional to 331.12, 492.94 and 326.56 is: 486.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.12 : 492.94 = 326.56 : x
  2. Step 2: Convert to fraction form
    331.12/492.94 = 326.56/x
  3. Step 3: Cross multiply
    331.12x = 492.94 × 326.56
  4. Step 4: Simplify right side
    331.12x = 160,974.49
  5. Step 5: Solve for x
    x = 160,974.49/331.12
  6. Step 6: Final answer
    x = 486.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.