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Finding the Fourth Proportional to 197.88, 272.76 and 127.91

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Solution

The fourth proportional to 197.88, 272.76 and 127.91 is: 176.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.88 : 272.76 = 127.91 : x
  2. Step 2: Convert to fraction form
    197.88/272.76 = 127.91/x
  3. Step 3: Cross multiply
    197.88x = 272.76 × 127.91
  4. Step 4: Simplify right side
    197.88x = 34,887.37
  5. Step 5: Solve for x
    x = 34,887.37/197.88
  6. Step 6: Final answer
    x = 176.31

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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.