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Finding the Fourth Proportional to 648, 894.42 and 438.48

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Solution

The fourth proportional to 648, 894.42 and 438.48 is: 605.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    648 : 894.42 = 438.48 : x
  2. Step 2: Convert to fraction form
    648/894.42 = 438.48/x
  3. Step 3: Cross multiply
    648x = 894.42 × 438.48
  4. Step 4: Simplify right side
    648x = 392,185.28
  5. Step 5: Solve for x
    x = 392,185.28/648
  6. Step 6: Final answer
    x = 605.22

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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.