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Finding the Fourth Proportional to 197.50, 272.55 and 128.62

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Solution

The fourth proportional to 197.50, 272.55 and 128.62 is: 177.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.50 : 272.55 = 128.62 : x
  2. Step 2: Convert to fraction form
    197.50/272.55 = 128.62/x
  3. Step 3: Cross multiply
    197.50x = 272.55 × 128.62
  4. Step 4: Simplify right side
    197.50x = 35,055.38
  5. Step 5: Solve for x
    x = 35,055.38/197.50
  6. Step 6: Final answer
    x = 177.50

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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.