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Finding the Fourth Proportional to 197.59, 272.81 and 135.40

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Solution

The fourth proportional to 197.59, 272.81 and 135.40 is: 186.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.59 : 272.81 = 135.40 : x
  2. Step 2: Convert to fraction form
    197.59/272.81 = 135.40/x
  3. Step 3: Cross multiply
    197.59x = 272.81 × 135.40
  4. Step 4: Simplify right side
    197.59x = 36,938.48
  5. Step 5: Solve for x
    x = 36,938.48/197.59
  6. Step 6: Final answer
    x = 186.94

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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.