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Finding the Fourth Proportional to 412.73, 619.08 and 138.85

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Solution

The fourth proportional to 412.73, 619.08 and 138.85 is: 208.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.73 : 619.08 = 138.85 : x
  2. Step 2: Convert to fraction form
    412.73/619.08 = 138.85/x
  3. Step 3: Cross multiply
    412.73x = 619.08 × 138.85
  4. Step 4: Simplify right side
    412.73x = 85,959.26
  5. Step 5: Solve for x
    x = 85,959.26/412.73
  6. Step 6: Final answer
    x = 208.27

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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.