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Finding the Fourth Proportional to 386.18, 533.04 and 220.49

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Solution

The fourth proportional to 386.18, 533.04 and 220.49 is: 304.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.18 : 533.04 = 220.49 : x
  2. Step 2: Convert to fraction form
    386.18/533.04 = 220.49/x
  3. Step 3: Cross multiply
    386.18x = 533.04 × 220.49
  4. Step 4: Simplify right side
    386.18x = 117,529.99
  5. Step 5: Solve for x
    x = 117,529.99/386.18
  6. Step 6: Final answer
    x = 304.34

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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.