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Finding the Fourth Proportional to 353.34, 487.89 and 255.42

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Solution

The fourth proportional to 353.34, 487.89 and 255.42 is: 352.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.34 : 487.89 = 255.42 : x
  2. Step 2: Convert to fraction form
    353.34/487.89 = 255.42/x
  3. Step 3: Cross multiply
    353.34x = 487.89 × 255.42
  4. Step 4: Simplify right side
    353.34x = 124,616.86
  5. Step 5: Solve for x
    x = 124,616.86/353.34
  6. Step 6: Final answer
    x = 352.68

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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.