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Finding the Fourth Proportional to 142.09, 196.13 and 100.67

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Solution

The fourth proportional to 142.09, 196.13 and 100.67 is: 138.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.09 : 196.13 = 100.67 : x
  2. Step 2: Convert to fraction form
    142.09/196.13 = 100.67/x
  3. Step 3: Cross multiply
    142.09x = 196.13 × 100.67
  4. Step 4: Simplify right side
    142.09x = 19,743.68
  5. Step 5: Solve for x
    x = 19,743.68/142.09
  6. Step 6: Final answer
    x = 138.95

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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.