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Finding the Fourth Proportional to 304.20, 420.38 and 225.62

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Solution

The fourth proportional to 304.20, 420.38 and 225.62 is: 311.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.20 : 420.38 = 225.62 : x
  2. Step 2: Convert to fraction form
    304.20/420.38 = 225.62/x
  3. Step 3: Cross multiply
    304.20x = 420.38 × 225.62
  4. Step 4: Simplify right side
    304.20x = 94,846.14
  5. Step 5: Solve for x
    x = 94,846.14/304.20
  6. Step 6: Final answer
    x = 311.79

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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.