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Finding the Fourth Proportional to 255.35, 382.95 and 72.75

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Solution

The fourth proportional to 255.35, 382.95 and 72.75 is: 109.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.35 : 382.95 = 72.75 : x
  2. Step 2: Convert to fraction form
    255.35/382.95 = 72.75/x
  3. Step 3: Cross multiply
    255.35x = 382.95 × 72.75
  4. Step 4: Simplify right side
    255.35x = 27,859.61
  5. Step 5: Solve for x
    x = 27,859.61/255.35
  6. Step 6: Final answer
    x = 109.10

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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.