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Finding the Fourth Proportional to 438.62, 605.29 and 239.46

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Solution

The fourth proportional to 438.62, 605.29 and 239.46 is: 330.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.62 : 605.29 = 239.46 : x
  2. Step 2: Convert to fraction form
    438.62/605.29 = 239.46/x
  3. Step 3: Cross multiply
    438.62x = 605.29 × 239.46
  4. Step 4: Simplify right side
    438.62x = 144,942.74
  5. Step 5: Solve for x
    x = 144,942.74/438.62
  6. Step 6: Final answer
    x = 330.45

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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.