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Finding the Fourth Proportional to 353.78, 487.94 and 222.74

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Solution

The fourth proportional to 353.78, 487.94 and 222.74 is: 307.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.78 : 487.94 = 222.74 : x
  2. Step 2: Convert to fraction form
    353.78/487.94 = 222.74/x
  3. Step 3: Cross multiply
    353.78x = 487.94 × 222.74
  4. Step 4: Simplify right side
    353.78x = 108,683.76
  5. Step 5: Solve for x
    x = 108,683.76/353.78
  6. Step 6: Final answer
    x = 307.21

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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.