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Finding the Fourth Proportional to 132.15, 198.30 and 74.44

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Solution

The fourth proportional to 132.15, 198.30 and 74.44 is: 111.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.15 : 198.30 = 74.44 : x
  2. Step 2: Convert to fraction form
    132.15/198.30 = 74.44/x
  3. Step 3: Cross multiply
    132.15x = 198.30 × 74.44
  4. Step 4: Simplify right side
    132.15x = 14,761.45
  5. Step 5: Solve for x
    x = 14,761.45/132.15
  6. Step 6: Final answer
    x = 111.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.