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Finding the Fourth Proportional to 271.20, 374.21 and 153.15

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Solution

The fourth proportional to 271.20, 374.21 and 153.15 is: 211.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.20 : 374.21 = 153.15 : x
  2. Step 2: Convert to fraction form
    271.20/374.21 = 153.15/x
  3. Step 3: Cross multiply
    271.20x = 374.21 × 153.15
  4. Step 4: Simplify right side
    271.20x = 57,309.50
  5. Step 5: Solve for x
    x = 57,309.50/271.20
  6. Step 6: Final answer
    x = 211.32

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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.