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Finding the Fourth Proportional to 355.40, 490.66 and 239.08

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Solution

The fourth proportional to 355.40, 490.66 and 239.08 is: 330.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.40 : 490.66 = 239.08 : x
  2. Step 2: Convert to fraction form
    355.40/490.66 = 239.08/x
  3. Step 3: Cross multiply
    355.40x = 490.66 × 239.08
  4. Step 4: Simplify right side
    355.40x = 117,306.99
  5. Step 5: Solve for x
    x = 117,306.99/355.40
  6. Step 6: Final answer
    x = 330.07

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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.