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Finding the Fourth Proportional to 142.21, 196.03 and 100.70

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Solution

The fourth proportional to 142.21, 196.03 and 100.70 is: 138.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.21 : 196.03 = 100.70 : x
  2. Step 2: Convert to fraction form
    142.21/196.03 = 100.70/x
  3. Step 3: Cross multiply
    142.21x = 196.03 × 100.70
  4. Step 4: Simplify right side
    142.21x = 19,740.22
  5. Step 5: Solve for x
    x = 19,740.22/142.21
  6. Step 6: Final answer
    x = 138.81

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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.