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Finding the Fourth Proportional to 149.85, 206.61 and 109.95

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Solution

The fourth proportional to 149.85, 206.61 and 109.95 is: 151.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.85 : 206.61 = 109.95 : x
  2. Step 2: Convert to fraction form
    149.85/206.61 = 109.95/x
  3. Step 3: Cross multiply
    149.85x = 206.61 × 109.95
  4. Step 4: Simplify right side
    149.85x = 22,716.22
  5. Step 5: Solve for x
    x = 22,716.22/149.85
  6. Step 6: Final answer
    x = 151.60

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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.