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Finding the Fourth Proportional to 141.99, 213.03 and 69.81

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Solution

The fourth proportional to 141.99, 213.03 and 69.81 is: 104.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.99 : 213.03 = 69.81 : x
  2. Step 2: Convert to fraction form
    141.99/213.03 = 69.81/x
  3. Step 3: Cross multiply
    141.99x = 213.03 × 69.81
  4. Step 4: Simplify right side
    141.99x = 14,871.62
  5. Step 5: Solve for x
    x = 14,871.62/141.99
  6. Step 6: Final answer
    x = 104.74

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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.