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Finding the Fourth Proportional to 306.75, 423.45 and 190.38

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Solution

The fourth proportional to 306.75, 423.45 and 190.38 is: 262.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.75 : 423.45 = 190.38 : x
  2. Step 2: Convert to fraction form
    306.75/423.45 = 190.38/x
  3. Step 3: Cross multiply
    306.75x = 423.45 × 190.38
  4. Step 4: Simplify right side
    306.75x = 80,616.41
  5. Step 5: Solve for x
    x = 80,616.41/306.75
  6. Step 6: Final answer
    x = 262.81

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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.