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Finding the Fourth Proportional to 198.02, 272.81 and 156.56

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Solution

The fourth proportional to 198.02, 272.81 and 156.56 is: 215.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.02 : 272.81 = 156.56 : x
  2. Step 2: Convert to fraction form
    198.02/272.81 = 156.56/x
  3. Step 3: Cross multiply
    198.02x = 272.81 × 156.56
  4. Step 4: Simplify right side
    198.02x = 42,709.77
  5. Step 5: Solve for x
    x = 42,709.77/198.02
  6. Step 6: Final answer
    x = 215.69

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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.