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Finding the Fourth Proportional to 142.05, 196.08 and 98.43

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Solution

The fourth proportional to 142.05, 196.08 and 98.43 is: 135.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.05 : 196.08 = 98.43 : x
  2. Step 2: Convert to fraction form
    142.05/196.08 = 98.43/x
  3. Step 3: Cross multiply
    142.05x = 196.08 × 98.43
  4. Step 4: Simplify right side
    142.05x = 19,300.15
  5. Step 5: Solve for x
    x = 19,300.15/142.05
  6. Step 6: Final answer
    x = 135.87

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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.