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Finding the Fourth Proportional to 355.76, 491.34 and 239.12

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Solution

The fourth proportional to 355.76, 491.34 and 239.12 is: 330.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.76 : 491.34 = 239.12 : x
  2. Step 2: Convert to fraction form
    355.76/491.34 = 239.12/x
  3. Step 3: Cross multiply
    355.76x = 491.34 × 239.12
  4. Step 4: Simplify right side
    355.76x = 117,489.22
  5. Step 5: Solve for x
    x = 117,489.22/355.76
  6. Step 6: Final answer
    x = 330.25

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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.