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Finding the Fourth Proportional to 309.56, 426.92 and 243.18

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Solution

The fourth proportional to 309.56, 426.92 and 243.18 is: 335.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.56 : 426.92 = 243.18 : x
  2. Step 2: Convert to fraction form
    309.56/426.92 = 243.18/x
  3. Step 3: Cross multiply
    309.56x = 426.92 × 243.18
  4. Step 4: Simplify right side
    309.56x = 103,817.19
  5. Step 5: Solve for x
    x = 103,817.19/309.56
  6. Step 6: Final answer
    x = 335.38

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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.