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Finding the Fourth Proportional to 438.73, 605.29 and 281.38

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Solution

The fourth proportional to 438.73, 605.29 and 281.38 is: 388.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.73 : 605.29 = 281.38 : x
  2. Step 2: Convert to fraction form
    438.73/605.29 = 281.38/x
  3. Step 3: Cross multiply
    438.73x = 605.29 × 281.38
  4. Step 4: Simplify right side
    438.73x = 170,316.50
  5. Step 5: Solve for x
    x = 170,316.50/438.73
  6. Step 6: Final answer
    x = 388.20

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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.