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Finding the Fourth Proportional to 331.02, 457.38 and 287.28

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Solution

The fourth proportional to 331.02, 457.38 and 287.28 is: 396.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.02 : 457.38 = 287.28 : x
  2. Step 2: Convert to fraction form
    331.02/457.38 = 287.28/x
  3. Step 3: Cross multiply
    331.02x = 457.38 × 287.28
  4. Step 4: Simplify right side
    331.02x = 131,396.13
  5. Step 5: Solve for x
    x = 131,396.13/331.02
  6. Step 6: Final answer
    x = 396.94

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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.