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Finding the Fourth Proportional to 197, 271.80 and 123.39

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Solution

The fourth proportional to 197, 271.80 and 123.39 is: 170.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    197 : 271.80 = 123.39 : x
  2. Step 2: Convert to fraction form
    197/271.80 = 123.39/x
  3. Step 3: Cross multiply
    197x = 271.80 × 123.39
  4. Step 4: Simplify right side
    197x = 33,537.40
  5. Step 5: Solve for x
    x = 33,537.40/197
  6. Step 6: Final answer
    x = 170.24

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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.