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Finding the Fourth Proportional to 202.18, 279.11 and 143.29

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Solution

The fourth proportional to 202.18, 279.11 and 143.29 is: 197.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.18 : 279.11 = 143.29 : x
  2. Step 2: Convert to fraction form
    202.18/279.11 = 143.29/x
  3. Step 3: Cross multiply
    202.18x = 279.11 × 143.29
  4. Step 4: Simplify right side
    202.18x = 39,993.67
  5. Step 5: Solve for x
    x = 39,993.67/202.18
  6. Step 6: Final answer
    x = 197.81

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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.