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Finding the Fourth Proportional to 197.56, 272.76 and 139.24

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Solution

The fourth proportional to 197.56, 272.76 and 139.24 is: 192.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.56 : 272.76 = 139.24 : x
  2. Step 2: Convert to fraction form
    197.56/272.76 = 139.24/x
  3. Step 3: Cross multiply
    197.56x = 272.76 × 139.24
  4. Step 4: Simplify right side
    197.56x = 37,979.10
  5. Step 5: Solve for x
    x = 37,979.10/197.56
  6. Step 6: Final answer
    x = 192.24

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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.