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Finding the Fourth Proportional to 306.57, 423.99 and 273.78

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Solution

The fourth proportional to 306.57, 423.99 and 273.78 is: 378.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.57 : 423.99 = 273.78 : x
  2. Step 2: Convert to fraction form
    306.57/423.99 = 273.78/x
  3. Step 3: Cross multiply
    306.57x = 423.99 × 273.78
  4. Step 4: Simplify right side
    306.57x = 116,079.98
  5. Step 5: Solve for x
    x = 116,079.98/306.57
  6. Step 6: Final answer
    x = 378.64

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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.