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Finding the Fourth Proportional to 149.21, 205.64 and 109.79

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Solution

The fourth proportional to 149.21, 205.64 and 109.79 is: 151.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.21 : 205.64 = 109.79 : x
  2. Step 2: Convert to fraction form
    149.21/205.64 = 109.79/x
  3. Step 3: Cross multiply
    149.21x = 205.64 × 109.79
  4. Step 4: Simplify right side
    149.21x = 22,576.82
  5. Step 5: Solve for x
    x = 22,576.82/149.21
  6. Step 6: Final answer
    x = 151.31

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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.