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Finding the Fourth Proportional to 309.24, 426.80 and 235.42

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Solution

The fourth proportional to 309.24, 426.80 and 235.42 is: 324.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.24 : 426.80 = 235.42 : x
  2. Step 2: Convert to fraction form
    309.24/426.80 = 235.42/x
  3. Step 3: Cross multiply
    309.24x = 426.80 × 235.42
  4. Step 4: Simplify right side
    309.24x = 100,476.78
  5. Step 5: Solve for x
    x = 100,476.78/309.24
  6. Step 6: Final answer
    x = 324.92

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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.