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Finding the Fourth Proportional to 309.66, 427.17 and 199.23

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Solution

The fourth proportional to 309.66, 427.17 and 199.23 is: 274.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.66 : 427.17 = 199.23 : x
  2. Step 2: Convert to fraction form
    309.66/427.17 = 199.23/x
  3. Step 3: Cross multiply
    309.66x = 427.17 × 199.23
  4. Step 4: Simplify right side
    309.66x = 85,105.08
  5. Step 5: Solve for x
    x = 85,105.08/309.66
  6. Step 6: Final answer
    x = 274.83

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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.