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Finding the Fourth Proportional to 308.52, 425.64 and 221.28

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Solution

The fourth proportional to 308.52, 425.64 and 221.28 is: 305.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.52 : 425.64 = 221.28 : x
  2. Step 2: Convert to fraction form
    308.52/425.64 = 221.28/x
  3. Step 3: Cross multiply
    308.52x = 425.64 × 221.28
  4. Step 4: Simplify right side
    308.52x = 94,185.62
  5. Step 5: Solve for x
    x = 94,185.62/308.52
  6. Step 6: Final answer
    x = 305.28

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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.