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Finding the Fourth Proportional to 285.88, 393.54 and 211.96

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Solution

The fourth proportional to 285.88, 393.54 and 211.96 is: 291.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.88 : 393.54 = 211.96 : x
  2. Step 2: Convert to fraction form
    285.88/393.54 = 211.96/x
  3. Step 3: Cross multiply
    285.88x = 393.54 × 211.96
  4. Step 4: Simplify right side
    285.88x = 83,414.74
  5. Step 5: Solve for x
    x = 83,414.74/285.88
  6. Step 6: Final answer
    x = 291.78

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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.