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Finding the Fourth Proportional to 304.91, 421.43 and 239.30

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Solution

The fourth proportional to 304.91, 421.43 and 239.30 is: 330.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.91 : 421.43 = 239.30 : x
  2. Step 2: Convert to fraction form
    304.91/421.43 = 239.30/x
  3. Step 3: Cross multiply
    304.91x = 421.43 × 239.30
  4. Step 4: Simplify right side
    304.91x = 100,844.90
  5. Step 5: Solve for x
    x = 100,844.90/304.91
  6. Step 6: Final answer
    x = 330.74

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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.