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Finding the Fourth Proportional to 143.02, 198.15 and 139.94

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Solution

The fourth proportional to 143.02, 198.15 and 139.94 is: 193.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.02 : 198.15 = 139.94 : x
  2. Step 2: Convert to fraction form
    143.02/198.15 = 139.94/x
  3. Step 3: Cross multiply
    143.02x = 198.15 × 139.94
  4. Step 4: Simplify right side
    143.02x = 27,729.64
  5. Step 5: Solve for x
    x = 27,729.64/143.02
  6. Step 6: Final answer
    x = 193.89

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.