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Finding the Fourth Proportional to 143.28, 215.78 and 107.46

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Solution

The fourth proportional to 143.28, 215.78 and 107.46 is: 161.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.28 : 215.78 = 107.46 : x
  2. Step 2: Convert to fraction form
    143.28/215.78 = 107.46/x
  3. Step 3: Cross multiply
    143.28x = 215.78 × 107.46
  4. Step 4: Simplify right side
    143.28x = 23,187.18
  5. Step 5: Solve for x
    x = 23,187.18/143.28
  6. Step 6: Final answer
    x = 161.83

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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.