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Finding the Fourth Proportional to 143.12, 197.39 and 99.38

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Solution

The fourth proportional to 143.12, 197.39 and 99.38 is: 137.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.12 : 197.39 = 99.38 : x
  2. Step 2: Convert to fraction form
    143.12/197.39 = 99.38/x
  3. Step 3: Cross multiply
    143.12x = 197.39 × 99.38
  4. Step 4: Simplify right side
    143.12x = 19,615.69
  5. Step 5: Solve for x
    x = 19,615.69/143.12
  6. Step 6: Final answer
    x = 137.06

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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.