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Finding the Fourth Proportional to 142.23, 196.12 and 100.65

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Solution

The fourth proportional to 142.23, 196.12 and 100.65 is: 138.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.23 : 196.12 = 100.65 : x
  2. Step 2: Convert to fraction form
    142.23/196.12 = 100.65/x
  3. Step 3: Cross multiply
    142.23x = 196.12 × 100.65
  4. Step 4: Simplify right side
    142.23x = 19,739.48
  5. Step 5: Solve for x
    x = 19,739.48/142.23
  6. Step 6: Final answer
    x = 138.79

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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.