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Finding the Fourth Proportional to 438.70, 605.41 and 239.53

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Solution

The fourth proportional to 438.70, 605.41 and 239.53 is: 330.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.70 : 605.41 = 239.53 : x
  2. Step 2: Convert to fraction form
    438.70/605.41 = 239.53/x
  3. Step 3: Cross multiply
    438.70x = 605.41 × 239.53
  4. Step 4: Simplify right side
    438.70x = 145,011.15
  5. Step 5: Solve for x
    x = 145,011.15/438.70
  6. Step 6: Final answer
    x = 330.55

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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.