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Finding the Fourth Proportional to 185.40, 255.78 and 107.80

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Solution

The fourth proportional to 185.40, 255.78 and 107.80 is: 148.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.40 : 255.78 = 107.80 : x
  2. Step 2: Convert to fraction form
    185.40/255.78 = 107.80/x
  3. Step 3: Cross multiply
    185.40x = 255.78 × 107.80
  4. Step 4: Simplify right side
    185.40x = 27,573.08
  5. Step 5: Solve for x
    x = 27,573.08/185.40
  6. Step 6: Final answer
    x = 148.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.