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Finding the Fourth Proportional to 308.77, 425.51 and 221.29

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Solution

The fourth proportional to 308.77, 425.51 and 221.29 is: 304.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.77 : 425.51 = 221.29 : x
  2. Step 2: Convert to fraction form
    308.77/425.51 = 221.29/x
  3. Step 3: Cross multiply
    308.77x = 425.51 × 221.29
  4. Step 4: Simplify right side
    308.77x = 94,161.11
  5. Step 5: Solve for x
    x = 94,161.11/308.77
  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.