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Finding the Fourth Proportional to 386.44, 533.30 and 211.79

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Solution

The fourth proportional to 386.44, 533.30 and 211.79 is: 292.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.44 : 533.30 = 211.79 : x
  2. Step 2: Convert to fraction form
    386.44/533.30 = 211.79/x
  3. Step 3: Cross multiply
    386.44x = 533.30 × 211.79
  4. Step 4: Simplify right side
    386.44x = 112,947.88
  5. Step 5: Solve for x
    x = 112,947.88/386.44
  6. Step 6: Final answer
    x = 292.28

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.