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Finding the Fourth Proportional to 150.75, 208.19 and 111.87

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Solution

The fourth proportional to 150.75, 208.19 and 111.87 is: 154.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.75 : 208.19 = 111.87 : x
  2. Step 2: Convert to fraction form
    150.75/208.19 = 111.87/x
  3. Step 3: Cross multiply
    150.75x = 208.19 × 111.87
  4. Step 4: Simplify right side
    150.75x = 23,290.49
  5. Step 5: Solve for x
    x = 23,290.49/150.75
  6. Step 6: Final answer
    x = 154.50

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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.