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Finding the Fourth Proportional to 438.57, 605.07 and 272.79

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Solution

The fourth proportional to 438.57, 605.07 and 272.79 is: 376.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.57 : 605.07 = 272.79 : x
  2. Step 2: Convert to fraction form
    438.57/605.07 = 272.79/x
  3. Step 3: Cross multiply
    438.57x = 605.07 × 272.79
  4. Step 4: Simplify right side
    438.57x = 165,057.05
  5. Step 5: Solve for x
    x = 165,057.05/438.57
  6. Step 6: Final answer
    x = 376.35

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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.