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Finding the Fourth Proportional to 101.72, 140.19 and 74.05

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Solution

The fourth proportional to 101.72, 140.19 and 74.05 is: 102.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.72 : 140.19 = 74.05 : x
  2. Step 2: Convert to fraction form
    101.72/140.19 = 74.05/x
  3. Step 3: Cross multiply
    101.72x = 140.19 × 74.05
  4. Step 4: Simplify right side
    101.72x = 10,380.37
  5. Step 5: Solve for x
    x = 10,380.37/101.72
  6. Step 6: Final answer
    x = 102.05

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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.