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Finding the Fourth Proportional to 149.67, 205.88 and 127.80

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Solution

The fourth proportional to 149.67, 205.88 and 127.80 is: 175.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.67 : 205.88 = 127.80 : x
  2. Step 2: Convert to fraction form
    149.67/205.88 = 127.80/x
  3. Step 3: Cross multiply
    149.67x = 205.88 × 127.80
  4. Step 4: Simplify right side
    149.67x = 26,310.83
  5. Step 5: Solve for x
    x = 26,310.83/149.67
  6. Step 6: Final answer
    x = 175.79

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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.