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Finding the Fourth Proportional to 255.85, 383.92 and 169.28

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Solution

The fourth proportional to 255.85, 383.92 and 169.28 is: 254.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.85 : 383.92 = 169.28 : x
  2. Step 2: Convert to fraction form
    255.85/383.92 = 169.28/x
  3. Step 3: Cross multiply
    255.85x = 383.92 × 169.28
  4. Step 4: Simplify right side
    255.85x = 64,989.98
  5. Step 5: Solve for x
    x = 64,989.98/255.85
  6. Step 6: Final answer
    x = 254.02

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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.