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Finding the Fourth Proportional to 308.48, 460.96 and 221.40

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Solution

The fourth proportional to 308.48, 460.96 and 221.40 is: 330.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.48 : 460.96 = 221.40 : x
  2. Step 2: Convert to fraction form
    308.48/460.96 = 221.40/x
  3. Step 3: Cross multiply
    308.48x = 460.96 × 221.40
  4. Step 4: Simplify right side
    308.48x = 102,055.99
  5. Step 5: Solve for x
    x = 102,055.99/308.48
  6. Step 6: Final answer
    x = 330.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.