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Finding the Fourth Proportional to 197.60, 272.52 and 139.40

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Solution

The fourth proportional to 197.60, 272.52 and 139.40 is: 192.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.60 : 272.52 = 139.40 : x
  2. Step 2: Convert to fraction form
    197.60/272.52 = 139.40/x
  3. Step 3: Cross multiply
    197.60x = 272.52 × 139.40
  4. Step 4: Simplify right side
    197.60x = 37,989.29
  5. Step 5: Solve for x
    x = 37,989.29/197.60
  6. Step 6: Final answer
    x = 192.25

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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.