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Finding the Fourth Proportional to 143.83, 199.43 and 138.70

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Solution

The fourth proportional to 143.83, 199.43 and 138.70 is: 192.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.83 : 199.43 = 138.70 : x
  2. Step 2: Convert to fraction form
    143.83/199.43 = 138.70/x
  3. Step 3: Cross multiply
    143.83x = 199.43 × 138.70
  4. Step 4: Simplify right side
    143.83x = 27,660.94
  5. Step 5: Solve for x
    x = 27,660.94/143.83
  6. Step 6: Final answer
    x = 192.32

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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.