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Finding the Fourth Proportional to 196.44, 271.20 and 155.16

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Solution

The fourth proportional to 196.44, 271.20 and 155.16 is: 214.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.44 : 271.20 = 155.16 : x
  2. Step 2: Convert to fraction form
    196.44/271.20 = 155.16/x
  3. Step 3: Cross multiply
    196.44x = 271.20 × 155.16
  4. Step 4: Simplify right side
    196.44x = 42,079.39
  5. Step 5: Solve for x
    x = 42,079.39/196.44
  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.