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Finding the Fourth Proportional to 352.40, 486.16 and 221.20

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Solution

The fourth proportional to 352.40, 486.16 and 221.20 is: 305.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.40 : 486.16 = 221.20 : x
  2. Step 2: Convert to fraction form
    352.40/486.16 = 221.20/x
  3. Step 3: Cross multiply
    352.40x = 486.16 × 221.20
  4. Step 4: Simplify right side
    352.40x = 107,538.59
  5. Step 5: Solve for x
    x = 107,538.59/352.40
  6. Step 6: Final answer
    x = 305.16

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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.