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Finding the Fourth Proportional to 140.74, 194.43 and 139.66

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Solution

The fourth proportional to 140.74, 194.43 and 139.66 is: 192.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.74 : 194.43 = 139.66 : x
  2. Step 2: Convert to fraction form
    140.74/194.43 = 139.66/x
  3. Step 3: Cross multiply
    140.74x = 194.43 × 139.66
  4. Step 4: Simplify right side
    140.74x = 27,154.09
  5. Step 5: Solve for x
    x = 27,154.09/140.74
  6. Step 6: Final answer
    x = 192.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.