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Finding the Fourth Proportional to 255, 381.78 and 131.34

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Solution

The fourth proportional to 255, 381.78 and 131.34 is: 196.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    255 : 381.78 = 131.34 : x
  2. Step 2: Convert to fraction form
    255/381.78 = 131.34/x
  3. Step 3: Cross multiply
    255x = 381.78 × 131.34
  4. Step 4: Simplify right side
    255x = 50,142.99
  5. Step 5: Solve for x
    x = 50,142.99/255
  6. Step 6: Final answer
    x = 196.64

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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.