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Finding the Fourth Proportional to 353.92, 487.20 and 306.65

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Solution

The fourth proportional to 353.92, 487.20 and 306.65 is: 422.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.92 : 487.20 = 306.65 : x
  2. Step 2: Convert to fraction form
    353.92/487.20 = 306.65/x
  3. Step 3: Cross multiply
    353.92x = 487.20 × 306.65
  4. Step 4: Simplify right side
    353.92x = 149,399.88
  5. Step 5: Solve for x
    x = 149,399.88/353.92
  6. Step 6: Final answer
    x = 422.13

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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.