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Finding the Fourth Proportional to 255.28, 382.90 and 72.69

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Solution

The fourth proportional to 255.28, 382.90 and 72.69 is: 109.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.28 : 382.90 = 72.69 : x
  2. Step 2: Convert to fraction form
    255.28/382.90 = 72.69/x
  3. Step 3: Cross multiply
    255.28x = 382.90 × 72.69
  4. Step 4: Simplify right side
    255.28x = 27,833.00
  5. Step 5: Solve for x
    x = 27,833.00/255.28
  6. Step 6: Final answer
    x = 109.03

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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.