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Finding the Fourth Proportional to 142.21, 196.28 and 84.03

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Solution

The fourth proportional to 142.21, 196.28 and 84.03 is: 115.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.21 : 196.28 = 84.03 : x
  2. Step 2: Convert to fraction form
    142.21/196.28 = 84.03/x
  3. Step 3: Cross multiply
    142.21x = 196.28 × 84.03
  4. Step 4: Simplify right side
    142.21x = 16,493.41
  5. Step 5: Solve for x
    x = 16,493.41/142.21
  6. Step 6: Final answer
    x = 115.98

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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.