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Finding the Fourth Proportional to 355.95, 491.36 and 239.58

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Solution

The fourth proportional to 355.95, 491.36 and 239.58 is: 330.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.95 : 491.36 = 239.58 : x
  2. Step 2: Convert to fraction form
    355.95/491.36 = 239.58/x
  3. Step 3: Cross multiply
    355.95x = 491.36 × 239.58
  4. Step 4: Simplify right side
    355.95x = 117,720.03
  5. Step 5: Solve for x
    x = 117,720.03/355.95
  6. Step 6: Final answer
    x = 330.72

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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.