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Finding the Fourth Proportional to 149.85, 205.68 and 137.55

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Solution

The fourth proportional to 149.85, 205.68 and 137.55 is: 188.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.85 : 205.68 = 137.55 : x
  2. Step 2: Convert to fraction form
    149.85/205.68 = 137.55/x
  3. Step 3: Cross multiply
    149.85x = 205.68 × 137.55
  4. Step 4: Simplify right side
    149.85x = 28,291.28
  5. Step 5: Solve for x
    x = 28,291.28/149.85
  6. Step 6: Final answer
    x = 188.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.