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Finding the Fourth Proportional to 356.91, 492.65 and 239.12

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Solution

The fourth proportional to 356.91, 492.65 and 239.12 is: 330.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.91 : 492.65 = 239.12 : x
  2. Step 2: Convert to fraction form
    356.91/492.65 = 239.12/x
  3. Step 3: Cross multiply
    356.91x = 492.65 × 239.12
  4. Step 4: Simplify right side
    356.91x = 117,801.55
  5. Step 5: Solve for x
    x = 117,801.55/356.91
  6. Step 6: Final answer
    x = 330.06

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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.