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Finding the Fourth Proportional to 306.54, 423.18 and 213.80

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Solution

The fourth proportional to 306.54, 423.18 and 213.80 is: 295.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.54 : 423.18 = 213.80 : x
  2. Step 2: Convert to fraction form
    306.54/423.18 = 213.80/x
  3. Step 3: Cross multiply
    306.54x = 423.18 × 213.80
  4. Step 4: Simplify right side
    306.54x = 90,473.77
  5. Step 5: Solve for x
    x = 90,473.77/306.54
  6. Step 6: Final answer
    x = 295.15

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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.