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Finding the Fourth Proportional to 386.84, 533.79 and 221.03

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Solution

The fourth proportional to 386.84, 533.79 and 221.03 is: 304.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.84 : 533.79 = 221.03 : x
  2. Step 2: Convert to fraction form
    386.84/533.79 = 221.03/x
  3. Step 3: Cross multiply
    386.84x = 533.79 × 221.03
  4. Step 4: Simplify right side
    386.84x = 117,983.60
  5. Step 5: Solve for x
    x = 117,983.60/386.84
  6. Step 6: Final answer
    x = 304.99

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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.