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Finding the Fourth Proportional to 331.13, 457.17 and 243.65

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Solution

The fourth proportional to 331.13, 457.17 and 243.65 is: 336.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.13 : 457.17 = 243.65 : x
  2. Step 2: Convert to fraction form
    331.13/457.17 = 243.65/x
  3. Step 3: Cross multiply
    331.13x = 457.17 × 243.65
  4. Step 4: Simplify right side
    331.13x = 111,389.47
  5. Step 5: Solve for x
    x = 111,389.47/331.13
  6. Step 6: Final answer
    x = 336.39

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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.