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Finding the Fourth Proportional to 142.12, 195.89 and 107.09

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Solution

The fourth proportional to 142.12, 195.89 and 107.09 is: 147.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.12 : 195.89 = 107.09 : x
  2. Step 2: Convert to fraction form
    142.12/195.89 = 107.09/x
  3. Step 3: Cross multiply
    142.12x = 195.89 × 107.09
  4. Step 4: Simplify right side
    142.12x = 20,977.08
  5. Step 5: Solve for x
    x = 20,977.08/142.12
  6. Step 6: Final answer
    x = 147.60

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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.