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Finding the Fourth Proportional to 386.89, 533.92 and 212.24

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Solution

The fourth proportional to 386.89, 533.92 and 212.24 is: 292.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.89 : 533.92 = 212.24 : x
  2. Step 2: Convert to fraction form
    386.89/533.92 = 212.24/x
  3. Step 3: Cross multiply
    386.89x = 533.92 × 212.24
  4. Step 4: Simplify right side
    386.89x = 113,315.45
  5. Step 5: Solve for x
    x = 113,315.45/386.89
  6. Step 6: Final answer
    x = 292.89

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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.