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Finding the Fourth Proportional to 143.78, 216.80 and 134.21

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Solution

The fourth proportional to 143.78, 216.80 and 134.21 is: 202.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.78 : 216.80 = 134.21 : x
  2. Step 2: Convert to fraction form
    143.78/216.80 = 134.21/x
  3. Step 3: Cross multiply
    143.78x = 216.80 × 134.21
  4. Step 4: Simplify right side
    143.78x = 29,096.73
  5. Step 5: Solve for x
    x = 29,096.73/143.78
  6. Step 6: Final answer
    x = 202.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.