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Finding the Fourth Proportional to 386.42, 533.25 and 211.76

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Solution

The fourth proportional to 386.42, 533.25 and 211.76 is: 292.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.42 : 533.25 = 211.76 : x
  2. Step 2: Convert to fraction form
    386.42/533.25 = 211.76/x
  3. Step 3: Cross multiply
    386.42x = 533.25 × 211.76
  4. Step 4: Simplify right side
    386.42x = 112,922.35
  5. Step 5: Solve for x
    x = 112,922.35/386.42
  6. Step 6: Final answer
    x = 292.23

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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.