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Finding the Fourth Proportional to 353.43, 487.77 and 213.55

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Solution

The fourth proportional to 353.43, 487.77 and 213.55 is: 294.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.43 : 487.77 = 213.55 : x
  2. Step 2: Convert to fraction form
    353.43/487.77 = 213.55/x
  3. Step 3: Cross multiply
    353.43x = 487.77 × 213.55
  4. Step 4: Simplify right side
    353.43x = 104,163.28
  5. Step 5: Solve for x
    x = 104,163.28/353.43
  6. Step 6: Final answer
    x = 294.72

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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.