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Finding the Fourth Proportional to 438.56, 605.20 and 239.39

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Solution

The fourth proportional to 438.56, 605.20 and 239.39 is: 330.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.56 : 605.20 = 239.39 : x
  2. Step 2: Convert to fraction form
    438.56/605.20 = 239.39/x
  3. Step 3: Cross multiply
    438.56x = 605.20 × 239.39
  4. Step 4: Simplify right side
    438.56x = 144,878.83
  5. Step 5: Solve for x
    x = 144,878.83/438.56
  6. Step 6: Final answer
    x = 330.35

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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.