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Finding the Fourth Proportional to 262.78, 393.89 and 171.54

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Solution

The fourth proportional to 262.78, 393.89 and 171.54 is: 257.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.78 : 393.89 = 171.54 : x
  2. Step 2: Convert to fraction form
    262.78/393.89 = 171.54/x
  3. Step 3: Cross multiply
    262.78x = 393.89 × 171.54
  4. Step 4: Simplify right side
    262.78x = 67,567.03
  5. Step 5: Solve for x
    x = 67,567.03/262.78
  6. Step 6: Final answer
    x = 257.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.