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Finding the Fourth Proportional to 197.15, 271.46 and 155.57

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Solution

The fourth proportional to 197.15, 271.46 and 155.57 is: 214.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.15 : 271.46 = 155.57 : x
  2. Step 2: Convert to fraction form
    197.15/271.46 = 155.57/x
  3. Step 3: Cross multiply
    197.15x = 271.46 × 155.57
  4. Step 4: Simplify right side
    197.15x = 42,230.06
  5. Step 5: Solve for x
    x = 42,230.06/197.15
  6. Step 6: Final answer
    x = 214.21

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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.