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Finding the Fourth Proportional to 197.80, 272.86 and 156.22

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Solution

The fourth proportional to 197.80, 272.86 and 156.22 is: 215.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.80 : 272.86 = 156.22 : x
  2. Step 2: Convert to fraction form
    197.80/272.86 = 156.22/x
  3. Step 3: Cross multiply
    197.80x = 272.86 × 156.22
  4. Step 4: Simplify right side
    197.80x = 42,626.19
  5. Step 5: Solve for x
    x = 42,626.19/197.80
  6. Step 6: Final answer
    x = 215.50

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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.