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Finding the Fourth Proportional to 386.45, 533.29 and 220.66

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Solution

The fourth proportional to 386.45, 533.29 and 220.66 is: 304.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.45 : 533.29 = 220.66 : x
  2. Step 2: Convert to fraction form
    386.45/533.29 = 220.66/x
  3. Step 3: Cross multiply
    386.45x = 533.29 × 220.66
  4. Step 4: Simplify right side
    386.45x = 117,675.77
  5. Step 5: Solve for x
    x = 117,675.77/386.45
  6. Step 6: Final answer
    x = 304.50

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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.