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Finding the Fourth Proportional to 386.69, 533.67 and 220.92

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Solution

The fourth proportional to 386.69, 533.67 and 220.92 is: 304.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.69 : 533.67 = 220.92 : x
  2. Step 2: Convert to fraction form
    386.69/533.67 = 220.92/x
  3. Step 3: Cross multiply
    386.69x = 533.67 × 220.92
  4. Step 4: Simplify right side
    386.69x = 117,899.71
  5. Step 5: Solve for x
    x = 117,899.71/386.69
  6. Step 6: Final answer
    x = 304.90

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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.