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Finding the Fourth Proportional to 140.91, 211.49 and 89.43

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Solution

The fourth proportional to 140.91, 211.49 and 89.43 is: 134.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.91 : 211.49 = 89.43 : x
  2. Step 2: Convert to fraction form
    140.91/211.49 = 89.43/x
  3. Step 3: Cross multiply
    140.91x = 211.49 × 89.43
  4. Step 4: Simplify right side
    140.91x = 18,912.99
  5. Step 5: Solve for x
    x = 18,912.99/140.91
  6. Step 6: Final answer
    x = 134.22

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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.