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Finding the Fourth Proportional to 197.54, 272.57 and 128.50

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Solution

The fourth proportional to 197.54, 272.57 and 128.50 is: 177.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.54 : 272.57 = 128.50 : x
  2. Step 2: Convert to fraction form
    197.54/272.57 = 128.50/x
  3. Step 3: Cross multiply
    197.54x = 272.57 × 128.50
  4. Step 4: Simplify right side
    197.54x = 35,025.25
  5. Step 5: Solve for x
    x = 35,025.25/197.54
  6. Step 6: Final answer
    x = 177.31

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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.