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Finding the Fourth Proportional to 304.92, 420.90 and 239.16

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Solution

The fourth proportional to 304.92, 420.90 and 239.16 is: 330.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.92 : 420.90 = 239.16 : x
  2. Step 2: Convert to fraction form
    304.92/420.90 = 239.16/x
  3. Step 3: Cross multiply
    304.92x = 420.90 × 239.16
  4. Step 4: Simplify right side
    304.92x = 100,662.44
  5. Step 5: Solve for x
    x = 100,662.44/304.92
  6. Step 6: Final answer
    x = 330.13

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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.