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Finding the Fourth Proportional to 271.20, 374.06 and 172.78

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Solution

The fourth proportional to 271.20, 374.06 and 172.78 is: 238.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.20 : 374.06 = 172.78 : x
  2. Step 2: Convert to fraction form
    271.20/374.06 = 172.78/x
  3. Step 3: Cross multiply
    271.20x = 374.06 × 172.78
  4. Step 4: Simplify right side
    271.20x = 64,630.09
  5. Step 5: Solve for x
    x = 64,630.09/271.20
  6. Step 6: Final answer
    x = 238.31

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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.