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Finding the Fourth Proportional to 331.18, 456.99 and 189.38

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Solution

The fourth proportional to 331.18, 456.99 and 189.38 is: 261.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.18 : 456.99 = 189.38 : x
  2. Step 2: Convert to fraction form
    331.18/456.99 = 189.38/x
  3. Step 3: Cross multiply
    331.18x = 456.99 × 189.38
  4. Step 4: Simplify right side
    331.18x = 86,544.77
  5. Step 5: Solve for x
    x = 86,544.77/331.18
  6. Step 6: Final answer
    x = 261.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.