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Finding the Fourth Proportional to 308.89, 425.68 and 221.41

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Solution

The fourth proportional to 308.89, 425.68 and 221.41 is: 305.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.89 : 425.68 = 221.41 : x
  2. Step 2: Convert to fraction form
    308.89/425.68 = 221.41/x
  3. Step 3: Cross multiply
    308.89x = 425.68 × 221.41
  4. Step 4: Simplify right side
    308.89x = 94,249.81
  5. Step 5: Solve for x
    x = 94,249.81/308.89
  6. Step 6: Final answer
    x = 305.12

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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.