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Finding the Fourth Proportional to 141.21, 194.81 and 99.66

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Solution

The fourth proportional to 141.21, 194.81 and 99.66 is: 137.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.21 : 194.81 = 99.66 : x
  2. Step 2: Convert to fraction form
    141.21/194.81 = 99.66/x
  3. Step 3: Cross multiply
    141.21x = 194.81 × 99.66
  4. Step 4: Simplify right side
    141.21x = 19,415.00
  5. Step 5: Solve for x
    x = 19,415.00/141.21
  6. Step 6: Final answer
    x = 137.49

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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.