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Finding the Fourth Proportional to 306.75, 423.47 and 196.41

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Solution

The fourth proportional to 306.75, 423.47 and 196.41 is: 271.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.75 : 423.47 = 196.41 : x
  2. Step 2: Convert to fraction form
    306.75/423.47 = 196.41/x
  3. Step 3: Cross multiply
    306.75x = 423.47 × 196.41
  4. Step 4: Simplify right side
    306.75x = 83,173.85
  5. Step 5: Solve for x
    x = 83,173.85/306.75
  6. Step 6: Final answer
    x = 271.15

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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.