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Finding the Fourth Proportional to 140.99, 211.37 and 83.21

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Solution

The fourth proportional to 140.99, 211.37 and 83.21 is: 124.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.99 : 211.37 = 83.21 : x
  2. Step 2: Convert to fraction form
    140.99/211.37 = 83.21/x
  3. Step 3: Cross multiply
    140.99x = 211.37 × 83.21
  4. Step 4: Simplify right side
    140.99x = 17,586.62
  5. Step 5: Solve for x
    x = 17,586.62/140.99
  6. Step 6: Final answer
    x = 124.74

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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.