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Finding the Fourth Proportional to 255.15, 382.69 and 72.56

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Solution

The fourth proportional to 255.15, 382.69 and 72.56 is: 108.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.15 : 382.69 = 72.56 : x
  2. Step 2: Convert to fraction form
    255.15/382.69 = 72.56/x
  3. Step 3: Cross multiply
    255.15x = 382.69 × 72.56
  4. Step 4: Simplify right side
    255.15x = 27,767.99
  5. Step 5: Solve for x
    x = 27,767.99/255.15
  6. Step 6: Final answer
    x = 108.83

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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.