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Finding the Fourth Proportional to 197.30, 271.74 and 155.78

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Solution

The fourth proportional to 197.30, 271.74 and 155.78 is: 214.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.30 : 271.74 = 155.78 : x
  2. Step 2: Convert to fraction form
    197.30/271.74 = 155.78/x
  3. Step 3: Cross multiply
    197.30x = 271.74 × 155.78
  4. Step 4: Simplify right side
    197.30x = 42,331.66
  5. Step 5: Solve for x
    x = 42,331.66/197.30
  6. Step 6: Final answer
    x = 214.55

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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.