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Finding the Fourth Proportional to 309.24, 426.57 and 256.48

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Solution

The fourth proportional to 309.24, 426.57 and 256.48 is: 353.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.24 : 426.57 = 256.48 : x
  2. Step 2: Convert to fraction form
    309.24/426.57 = 256.48/x
  3. Step 3: Cross multiply
    309.24x = 426.57 × 256.48
  4. Step 4: Simplify right side
    309.24x = 109,405.61
  5. Step 5: Solve for x
    x = 109,405.61/309.24
  6. Step 6: Final answer
    x = 353.79

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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.