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Finding the Fourth Proportional to 255, 382.55 and 126.75

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Solution

The fourth proportional to 255, 382.55 and 126.75 is: 190.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    255 : 382.55 = 126.75 : x
  2. Step 2: Convert to fraction form
    255/382.55 = 126.75/x
  3. Step 3: Cross multiply
    255x = 382.55 × 126.75
  4. Step 4: Simplify right side
    255x = 48,487.58
  5. Step 5: Solve for x
    x = 48,487.58/255
  6. Step 6: Final answer
    x = 190.15

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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.