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Finding the Fourth Proportional to 109.45, 150.96 and 74.42

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Solution

The fourth proportional to 109.45, 150.96 and 74.42 is: 102.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.45 : 150.96 = 74.42 : x
  2. Step 2: Convert to fraction form
    109.45/150.96 = 74.42/x
  3. Step 3: Cross multiply
    109.45x = 150.96 × 74.42
  4. Step 4: Simplify right side
    109.45x = 11,234.53
  5. Step 5: Solve for x
    x = 11,234.53/109.45
  6. Step 6: Final answer
    x = 102.64

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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.