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Finding the Fourth Proportional to 438.74, 605.45 and 239.57

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Solution

The fourth proportional to 438.74, 605.45 and 239.57 is: 330.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.74 : 605.45 = 239.57 : x
  2. Step 2: Convert to fraction form
    438.74/605.45 = 239.57/x
  3. Step 3: Cross multiply
    438.74x = 605.45 × 239.57
  4. Step 4: Simplify right side
    438.74x = 145,043.43
  5. Step 5: Solve for x
    x = 145,043.43/438.74
  6. Step 6: Final answer
    x = 330.59

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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.