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Finding the Fourth Proportional to 101.90, 140.46 and 80.03

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Solution

The fourth proportional to 101.90, 140.46 and 80.03 is: 110.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.90 : 140.46 = 80.03 : x
  2. Step 2: Convert to fraction form
    101.90/140.46 = 80.03/x
  3. Step 3: Cross multiply
    101.90x = 140.46 × 80.03
  4. Step 4: Simplify right side
    101.90x = 11,241.01
  5. Step 5: Solve for x
    x = 11,241.01/101.90
  6. Step 6: Final answer
    x = 110.31

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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.