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Finding the Fourth Proportional to 352.55, 486.44 and 221.47

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Solution

The fourth proportional to 352.55, 486.44 and 221.47 is: 305.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.55 : 486.44 = 221.47 : x
  2. Step 2: Convert to fraction form
    352.55/486.44 = 221.47/x
  3. Step 3: Cross multiply
    352.55x = 486.44 × 221.47
  4. Step 4: Simplify right side
    352.55x = 107,730.37
  5. Step 5: Solve for x
    x = 107,730.37/352.55
  6. Step 6: Final answer
    x = 305.57

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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.