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Finding the Fourth Proportional to 438.49, 605.43 and 272.71

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Solution

The fourth proportional to 438.49, 605.43 and 272.71 is: 376.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.49 : 605.43 = 272.71 : x
  2. Step 2: Convert to fraction form
    438.49/605.43 = 272.71/x
  3. Step 3: Cross multiply
    438.49x = 605.43 × 272.71
  4. Step 4: Simplify right side
    438.49x = 165,102.42
  5. Step 5: Solve for x
    x = 165,102.42/438.49
  6. Step 6: Final answer
    x = 376.53

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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.