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Finding the Fourth Proportional to 141.98, 196.70 and 138.62

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Solution

The fourth proportional to 141.98, 196.70 and 138.62 is: 192.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.98 : 196.70 = 138.62 : x
  2. Step 2: Convert to fraction form
    141.98/196.70 = 138.62/x
  3. Step 3: Cross multiply
    141.98x = 196.70 × 138.62
  4. Step 4: Simplify right side
    141.98x = 27,266.55
  5. Step 5: Solve for x
    x = 27,266.55/141.98
  6. Step 6: Final answer
    x = 192.05

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.