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Finding the Fourth Proportional to 355.46, 490.65 and 239.18

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Solution

The fourth proportional to 355.46, 490.65 and 239.18 is: 330.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.46 : 490.65 = 239.18 : x
  2. Step 2: Convert to fraction form
    355.46/490.65 = 239.18/x
  3. Step 3: Cross multiply
    355.46x = 490.65 × 239.18
  4. Step 4: Simplify right side
    355.46x = 117,353.67
  5. Step 5: Solve for x
    x = 117,353.67/355.46
  6. Step 6: Final answer
    x = 330.15

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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.