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Finding the Fourth Proportional to 142.40, 196.49 and 80.22

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Solution

The fourth proportional to 142.40, 196.49 and 80.22 is: 110.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.40 : 196.49 = 80.22 : x
  2. Step 2: Convert to fraction form
    142.40/196.49 = 80.22/x
  3. Step 3: Cross multiply
    142.40x = 196.49 × 80.22
  4. Step 4: Simplify right side
    142.40x = 15,762.26
  5. Step 5: Solve for x
    x = 15,762.26/142.40
  6. Step 6: Final answer
    x = 110.69

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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.