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Finding the Fourth Proportional to 140.85, 194.37 and 91.74

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Solution

The fourth proportional to 140.85, 194.37 and 91.74 is: 126.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.85 : 194.37 = 91.74 : x
  2. Step 2: Convert to fraction form
    140.85/194.37 = 91.74/x
  3. Step 3: Cross multiply
    140.85x = 194.37 × 91.74
  4. Step 4: Simplify right side
    140.85x = 17,831.50
  5. Step 5: Solve for x
    x = 17,831.50/140.85
  6. Step 6: Final answer
    x = 126.60

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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.