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Finding the Fourth Proportional to 140.89, 211.15 and 121.63

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Solution

The fourth proportional to 140.89, 211.15 and 121.63 is: 182.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.89 : 211.15 = 121.63 : x
  2. Step 2: Convert to fraction form
    140.89/211.15 = 121.63/x
  3. Step 3: Cross multiply
    140.89x = 211.15 × 121.63
  4. Step 4: Simplify right side
    140.89x = 25,682.17
  5. Step 5: Solve for x
    x = 25,682.17/140.89
  6. Step 6: Final answer
    x = 182.29

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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.