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Finding the Fourth Proportional to 386.45, 533.30 and 220.69

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Solution

The fourth proportional to 386.45, 533.30 and 220.69 is: 304.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.45 : 533.30 = 220.69 : x
  2. Step 2: Convert to fraction form
    386.45/533.30 = 220.69/x
  3. Step 3: Cross multiply
    386.45x = 533.30 × 220.69
  4. Step 4: Simplify right side
    386.45x = 117,691.54
  5. Step 5: Solve for x
    x = 117,691.54/386.45
  6. Step 6: Final answer
    x = 304.55

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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.