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Finding the Fourth Proportional to 143.29, 197.75 and 84.28

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Solution

The fourth proportional to 143.29, 197.75 and 84.28 is: 116.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.29 : 197.75 = 84.28 : x
  2. Step 2: Convert to fraction form
    143.29/197.75 = 84.28/x
  3. Step 3: Cross multiply
    143.29x = 197.75 × 84.28
  4. Step 4: Simplify right side
    143.29x = 16,666.37
  5. Step 5: Solve for x
    x = 16,666.37/143.29
  6. Step 6: Final answer
    x = 116.31

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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.