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Finding the Fourth Proportional to 255.31, 382.89 and 72.72

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Solution

The fourth proportional to 255.31, 382.89 and 72.72 is: 109.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.31 : 382.89 = 72.72 : x
  2. Step 2: Convert to fraction form
    255.31/382.89 = 72.72/x
  3. Step 3: Cross multiply
    255.31x = 382.89 × 72.72
  4. Step 4: Simplify right side
    255.31x = 27,843.40
  5. Step 5: Solve for x
    x = 27,843.40/255.31
  6. Step 6: Final answer
    x = 109.06

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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.