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Finding the Fourth Proportional to 141.90, 195.75 and 120.30

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Solution

The fourth proportional to 141.90, 195.75 and 120.30 is: 165.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.90 : 195.75 = 120.30 : x
  2. Step 2: Convert to fraction form
    141.90/195.75 = 120.30/x
  3. Step 3: Cross multiply
    141.90x = 195.75 × 120.30
  4. Step 4: Simplify right side
    141.90x = 23,548.73
  5. Step 5: Solve for x
    x = 23,548.73/141.90
  6. Step 6: Final answer
    x = 165.95

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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.