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Finding the Fourth Proportional to 196.81, 271.31 and 155.28

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Solution

The fourth proportional to 196.81, 271.31 and 155.28 is: 214.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.81 : 271.31 = 155.28 : x
  2. Step 2: Convert to fraction form
    196.81/271.31 = 155.28/x
  3. Step 3: Cross multiply
    196.81x = 271.31 × 155.28
  4. Step 4: Simplify right side
    196.81x = 42,129.02
  5. Step 5: Solve for x
    x = 42,129.02/196.81
  6. Step 6: Final answer
    x = 214.06

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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.