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Finding the Fourth Proportional to 229.20, 316.36 and 221.20

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Solution

The fourth proportional to 229.20, 316.36 and 221.20 is: 305.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.20 : 316.36 = 221.20 : x
  2. Step 2: Convert to fraction form
    229.20/316.36 = 221.20/x
  3. Step 3: Cross multiply
    229.20x = 316.36 × 221.20
  4. Step 4: Simplify right side
    229.20x = 69,978.83
  5. Step 5: Solve for x
    x = 69,978.83/229.20
  6. Step 6: Final answer
    x = 305.32

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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.