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Finding the Fourth Proportional to 306.72, 423.44 and 213.48

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Solution

The fourth proportional to 306.72, 423.44 and 213.48 is: 294.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.72 : 423.44 = 213.48 : x
  2. Step 2: Convert to fraction form
    306.72/423.44 = 213.48/x
  3. Step 3: Cross multiply
    306.72x = 423.44 × 213.48
  4. Step 4: Simplify right side
    306.72x = 90,395.97
  5. Step 5: Solve for x
    x = 90,395.97/306.72
  6. Step 6: Final answer
    x = 294.72

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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.