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Finding the Fourth Proportional to 331.40, 457.17 and 282.80

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Solution

The fourth proportional to 331.40, 457.17 and 282.80 is: 390.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.40 : 457.17 = 282.80 : x
  2. Step 2: Convert to fraction form
    331.40/457.17 = 282.80/x
  3. Step 3: Cross multiply
    331.40x = 457.17 × 282.80
  4. Step 4: Simplify right side
    331.40x = 129,287.68
  5. Step 5: Solve for x
    x = 129,287.68/331.40
  6. Step 6: Final answer
    x = 390.13

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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.