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Finding the Fourth Proportional to 197.63, 272.79 and 153.89

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Solution

The fourth proportional to 197.63, 272.79 and 153.89 is: 212.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.63 : 272.79 = 153.89 : x
  2. Step 2: Convert to fraction form
    197.63/272.79 = 153.89/x
  3. Step 3: Cross multiply
    197.63x = 272.79 × 153.89
  4. Step 4: Simplify right side
    197.63x = 41,978.29
  5. Step 5: Solve for x
    x = 41,978.29/197.63
  6. Step 6: Final answer
    x = 212.41

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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.