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Finding the Fourth Proportional to 331.48, 457.14 and 287.56

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Solution

The fourth proportional to 331.48, 457.14 and 287.56 is: 396.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.48 : 457.14 = 287.56 : x
  2. Step 2: Convert to fraction form
    331.48/457.14 = 287.56/x
  3. Step 3: Cross multiply
    331.48x = 457.14 × 287.56
  4. Step 4: Simplify right side
    331.48x = 131,455.18
  5. Step 5: Solve for x
    x = 131,455.18/331.48
  6. Step 6: Final answer
    x = 396.57

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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.