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Finding the Fourth Proportional to 197.80, 272.91 and 154.45

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Solution

The fourth proportional to 197.80, 272.91 and 154.45 is: 213.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.80 : 272.91 = 154.45 : x
  2. Step 2: Convert to fraction form
    197.80/272.91 = 154.45/x
  3. Step 3: Cross multiply
    197.80x = 272.91 × 154.45
  4. Step 4: Simplify right side
    197.80x = 42,150.95
  5. Step 5: Solve for x
    x = 42,150.95/197.80
  6. Step 6: Final answer
    x = 213.10

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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.