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Finding the Fourth Proportional to 143.91, 215.49 and 111.31

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Solution

The fourth proportional to 143.91, 215.49 and 111.31 is: 166.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.91 : 215.49 = 111.31 : x
  2. Step 2: Convert to fraction form
    143.91/215.49 = 111.31/x
  3. Step 3: Cross multiply
    143.91x = 215.49 × 111.31
  4. Step 4: Simplify right side
    143.91x = 23,986.19
  5. Step 5: Solve for x
    x = 23,986.19/143.91
  6. Step 6: Final answer
    x = 166.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.