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Finding the Fourth Proportional to 197.40, 271.86 and 174.12

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Solution

The fourth proportional to 197.40, 271.86 and 174.12 is: 239.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.40 : 271.86 = 174.12 : x
  2. Step 2: Convert to fraction form
    197.40/271.86 = 174.12/x
  3. Step 3: Cross multiply
    197.40x = 271.86 × 174.12
  4. Step 4: Simplify right side
    197.40x = 47,336.26
  5. Step 5: Solve for x
    x = 47,336.26/197.40
  6. Step 6: Final answer
    x = 239.80

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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.