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Finding the Fourth Proportional to 197.67, 272.72 and 156.09

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Solution

The fourth proportional to 197.67, 272.72 and 156.09 is: 215.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.67 : 272.72 = 156.09 : x
  2. Step 2: Convert to fraction form
    197.67/272.72 = 156.09/x
  3. Step 3: Cross multiply
    197.67x = 272.72 × 156.09
  4. Step 4: Simplify right side
    197.67x = 42,569.26
  5. Step 5: Solve for x
    x = 42,569.26/197.67
  6. Step 6: Final answer
    x = 215.36

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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.