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Finding the Fourth Proportional to 143.18, 196.82 and 128.26

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Solution

The fourth proportional to 143.18, 196.82 and 128.26 is: 176.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.18 : 196.82 = 128.26 : x
  2. Step 2: Convert to fraction form
    143.18/196.82 = 128.26/x
  3. Step 3: Cross multiply
    143.18x = 196.82 × 128.26
  4. Step 4: Simplify right side
    143.18x = 25,244.13
  5. Step 5: Solve for x
    x = 25,244.13/143.18
  6. Step 6: Final answer
    x = 176.31

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.