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Finding the Fourth Proportional to 352.74, 486.64 and 221.52

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Solution

The fourth proportional to 352.74, 486.64 and 221.52 is: 305.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.74 : 486.64 = 221.52 : x
  2. Step 2: Convert to fraction form
    352.74/486.64 = 221.52/x
  3. Step 3: Cross multiply
    352.74x = 486.64 × 221.52
  4. Step 4: Simplify right side
    352.74x = 107,800.49
  5. Step 5: Solve for x
    x = 107,800.49/352.74
  6. Step 6: Final answer
    x = 305.61

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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.