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Finding the Fourth Proportional to 140.39, 211.43 and 122.57

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Solution

The fourth proportional to 140.39, 211.43 and 122.57 is: 184.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.39 : 211.43 = 122.57 : x
  2. Step 2: Convert to fraction form
    140.39/211.43 = 122.57/x
  3. Step 3: Cross multiply
    140.39x = 211.43 × 122.57
  4. Step 4: Simplify right side
    140.39x = 25,914.98
  5. Step 5: Solve for x
    x = 25,914.98/140.39
  6. Step 6: Final answer
    x = 184.59

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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.