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Finding the Fourth Proportional to 149.88, 205.69 and 137.64

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Solution

The fourth proportional to 149.88, 205.69 and 137.64 is: 188.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.88 : 205.69 = 137.64 : x
  2. Step 2: Convert to fraction form
    149.88/205.69 = 137.64/x
  3. Step 3: Cross multiply
    149.88x = 205.69 × 137.64
  4. Step 4: Simplify right side
    149.88x = 28,311.17
  5. Step 5: Solve for x
    x = 28,311.17/149.88
  6. Step 6: Final answer
    x = 188.89

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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.