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Finding the Fourth Proportional to 438.40, 605.19 and 272.89

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Solution

The fourth proportional to 438.40, 605.19 and 272.89 is: 376.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.40 : 605.19 = 272.89 : x
  2. Step 2: Convert to fraction form
    438.40/605.19 = 272.89/x
  3. Step 3: Cross multiply
    438.40x = 605.19 × 272.89
  4. Step 4: Simplify right side
    438.40x = 165,150.30
  5. Step 5: Solve for x
    x = 165,150.30/438.40
  6. Step 6: Final answer
    x = 376.71

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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.