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Finding the Fourth Proportional to 197.19, 272.22 and 157.71

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Solution

The fourth proportional to 197.19, 272.22 and 157.71 is: 217.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.19 : 272.22 = 157.71 : x
  2. Step 2: Convert to fraction form
    197.19/272.22 = 157.71/x
  3. Step 3: Cross multiply
    197.19x = 272.22 × 157.71
  4. Step 4: Simplify right side
    197.19x = 42,931.82
  5. Step 5: Solve for x
    x = 42,931.82/197.19
  6. Step 6: Final answer
    x = 217.72

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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.