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Finding the Fourth Proportional to 438.75, 605.75 and 273.21

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Solution

The fourth proportional to 438.75, 605.75 and 273.21 is: 377.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.75 : 605.75 = 273.21 : x
  2. Step 2: Convert to fraction form
    438.75/605.75 = 273.21/x
  3. Step 3: Cross multiply
    438.75x = 605.75 × 273.21
  4. Step 4: Simplify right side
    438.75x = 165,495.59
  5. Step 5: Solve for x
    x = 165,495.59/438.75
  6. Step 6: Final answer
    x = 377.20

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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.