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Finding the Fourth Proportional to 308.40, 425.34 and 221.12

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Solution

The fourth proportional to 308.40, 425.34 and 221.12 is: 304.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.40 : 425.34 = 221.12 : x
  2. Step 2: Convert to fraction form
    308.40/425.34 = 221.12/x
  3. Step 3: Cross multiply
    308.40x = 425.34 × 221.12
  4. Step 4: Simplify right side
    308.40x = 94,051.18
  5. Step 5: Solve for x
    x = 94,051.18/308.40
  6. Step 6: Final answer
    x = 304.96

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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.