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Finding the Fourth Proportional to 308.62, 425.58 and 221.68

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Solution

The fourth proportional to 308.62, 425.58 and 221.68 is: 305.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.62 : 425.58 = 221.68 : x
  2. Step 2: Convert to fraction form
    308.62/425.58 = 221.68/x
  3. Step 3: Cross multiply
    308.62x = 425.58 × 221.68
  4. Step 4: Simplify right side
    308.62x = 94,342.57
  5. Step 5: Solve for x
    x = 94,342.57/308.62
  6. Step 6: Final answer
    x = 305.69

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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.