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Finding the Fourth Proportional to 197.21, 271.77 and 155.81

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Solution

The fourth proportional to 197.21, 271.77 and 155.81 is: 214.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.21 : 271.77 = 155.81 : x
  2. Step 2: Convert to fraction form
    197.21/271.77 = 155.81/x
  3. Step 3: Cross multiply
    197.21x = 271.77 × 155.81
  4. Step 4: Simplify right side
    197.21x = 42,344.48
  5. Step 5: Solve for x
    x = 42,344.48/197.21
  6. Step 6: Final answer
    x = 214.72

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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.