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Finding the Fourth Proportional to 196.97, 271.62 and 155.45

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Solution

The fourth proportional to 196.97, 271.62 and 155.45 is: 214.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.97 : 271.62 = 155.45 : x
  2. Step 2: Convert to fraction form
    196.97/271.62 = 155.45/x
  3. Step 3: Cross multiply
    196.97x = 271.62 × 155.45
  4. Step 4: Simplify right side
    196.97x = 42,224.01
  5. Step 5: Solve for x
    x = 42,224.01/196.97
  6. Step 6: Final answer
    x = 214.37

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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.