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Finding the Fourth Proportional to 142.26, 196.12 and 105.30

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Solution

The fourth proportional to 142.26, 196.12 and 105.30 is: 145.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.26 : 196.12 = 105.30 : x
  2. Step 2: Convert to fraction form
    142.26/196.12 = 105.30/x
  3. Step 3: Cross multiply
    142.26x = 196.12 × 105.30
  4. Step 4: Simplify right side
    142.26x = 20,651.57
  5. Step 5: Solve for x
    x = 20,651.57/142.26
  6. Step 6: Final answer
    x = 145.17

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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.