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Finding the Fourth Proportional to 352.61, 486.58 and 221.69

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Solution

The fourth proportional to 352.61, 486.58 and 221.69 is: 305.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.61 : 486.58 = 221.69 : x
  2. Step 2: Convert to fraction form
    352.61/486.58 = 221.69/x
  3. Step 3: Cross multiply
    352.61x = 486.58 × 221.69
  4. Step 4: Simplify right side
    352.61x = 107,869.92
  5. Step 5: Solve for x
    x = 107,869.92/352.61
  6. Step 6: Final answer
    x = 305.92

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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.