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Finding the Fourth Proportional to 285.57, 393.44 and 196.97

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Solution

The fourth proportional to 285.57, 393.44 and 196.97 is: 271.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.57 : 393.44 = 196.97 : x
  2. Step 2: Convert to fraction form
    285.57/393.44 = 196.97/x
  3. Step 3: Cross multiply
    285.57x = 393.44 × 196.97
  4. Step 4: Simplify right side
    285.57x = 77,492.92
  5. Step 5: Solve for x
    x = 77,492.92/285.57
  6. Step 6: Final answer
    x = 271.36

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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.