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Finding the Fourth Proportional to 355.63, 490.39 and 243.61

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Solution

The fourth proportional to 355.63, 490.39 and 243.61 is: 335.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.63 : 490.39 = 243.61 : x
  2. Step 2: Convert to fraction form
    355.63/490.39 = 243.61/x
  3. Step 3: Cross multiply
    355.63x = 490.39 × 243.61
  4. Step 4: Simplify right side
    355.63x = 119,463.91
  5. Step 5: Solve for x
    x = 119,463.91/355.63
  6. Step 6: Final answer
    x = 335.92

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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.