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Finding the Fourth Proportional to 150.81, 208.12 and 81.81

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Solution

The fourth proportional to 150.81, 208.12 and 81.81 is: 112.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.81 : 208.12 = 81.81 : x
  2. Step 2: Convert to fraction form
    150.81/208.12 = 81.81/x
  3. Step 3: Cross multiply
    150.81x = 208.12 × 81.81
  4. Step 4: Simplify right side
    150.81x = 17,027.02
  5. Step 5: Solve for x
    x = 17,027.02/150.81
  6. Step 6: Final answer
    x = 112.90

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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.