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Finding the Fourth Proportional to 353.47, 487.74 and 222.39

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Solution

The fourth proportional to 353.47, 487.74 and 222.39 is: 306.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.47 : 487.74 = 222.39 : x
  2. Step 2: Convert to fraction form
    353.47/487.74 = 222.39/x
  3. Step 3: Cross multiply
    353.47x = 487.74 × 222.39
  4. Step 4: Simplify right side
    353.47x = 108,468.50
  5. Step 5: Solve for x
    x = 108,468.50/353.47
  6. Step 6: Final answer
    x = 306.87

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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.