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Finding the Fourth Proportional to 286.84, 429.62 and 221.39

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Solution

The fourth proportional to 286.84, 429.62 and 221.39 is: 331.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.84 : 429.62 = 221.39 : x
  2. Step 2: Convert to fraction form
    286.84/429.62 = 221.39/x
  3. Step 3: Cross multiply
    286.84x = 429.62 × 221.39
  4. Step 4: Simplify right side
    286.84x = 95,111.96
  5. Step 5: Solve for x
    x = 95,111.96/286.84
  6. Step 6: Final answer
    x = 331.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.