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Finding the Fourth Proportional to 142.49, 196.55 and 98.75

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Solution

The fourth proportional to 142.49, 196.55 and 98.75 is: 136.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.49 : 196.55 = 98.75 : x
  2. Step 2: Convert to fraction form
    142.49/196.55 = 98.75/x
  3. Step 3: Cross multiply
    142.49x = 196.55 × 98.75
  4. Step 4: Simplify right side
    142.49x = 19,408.58
  5. Step 5: Solve for x
    x = 19,408.58/142.49
  6. Step 6: Final answer
    x = 136.21

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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.