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Finding the Fourth Proportional to 331.16, 457.59 and 238.21

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Solution

The fourth proportional to 331.16, 457.59 and 238.21 is: 329.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.16 : 457.59 = 238.21 : x
  2. Step 2: Convert to fraction form
    331.16/457.59 = 238.21/x
  3. Step 3: Cross multiply
    331.16x = 457.59 × 238.21
  4. Step 4: Simplify right side
    331.16x = 109,002.19
  5. Step 5: Solve for x
    x = 109,002.19/331.16
  6. Step 6: Final answer
    x = 329.15

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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.