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Finding the Fourth Proportional to 149.85, 206.80 and 91.63

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Solution

The fourth proportional to 149.85, 206.80 and 91.63 is: 126.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.85 : 206.80 = 91.63 : x
  2. Step 2: Convert to fraction form
    149.85/206.80 = 91.63/x
  3. Step 3: Cross multiply
    149.85x = 206.80 × 91.63
  4. Step 4: Simplify right side
    149.85x = 18,949.08
  5. Step 5: Solve for x
    x = 18,949.08/149.85
  6. Step 6: Final answer
    x = 126.45

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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.