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Finding the Fourth Proportional to 142.72, 197.04 and 98.70

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Solution

The fourth proportional to 142.72, 197.04 and 98.70 is: 136.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.72 : 197.04 = 98.70 : x
  2. Step 2: Convert to fraction form
    142.72/197.04 = 98.70/x
  3. Step 3: Cross multiply
    142.72x = 197.04 × 98.70
  4. Step 4: Simplify right side
    142.72x = 19,447.85
  5. Step 5: Solve for x
    x = 19,447.85/142.72
  6. Step 6: Final answer
    x = 136.27

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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.