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Finding the Fourth Proportional to 197.10, 272 and 123.45

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Solution

The fourth proportional to 197.10, 272 and 123.45 is: 170.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.10 : 272 = 123.45 : x
  2. Step 2: Convert to fraction form
    197.10/272 = 123.45/x
  3. Step 3: Cross multiply
    197.10x = 272 × 123.45
  4. Step 4: Simplify right side
    197.10x = 33,578.40
  5. Step 5: Solve for x
    x = 33,578.40/197.10
  6. Step 6: Final answer
    x = 170.36

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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.