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Finding the Fourth Proportional to 255.95, 383.96 and 82.56

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Solution

The fourth proportional to 255.95, 383.96 and 82.56 is: 123.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.95 : 383.96 = 82.56 : x
  2. Step 2: Convert to fraction form
    255.95/383.96 = 82.56/x
  3. Step 3: Cross multiply
    255.95x = 383.96 × 82.56
  4. Step 4: Simplify right side
    255.95x = 31,699.32
  5. Step 5: Solve for x
    x = 31,699.32/255.95
  6. Step 6: Final answer
    x = 123.85

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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.