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Finding the Fourth Proportional to 438.26, 603.64 and 405.41

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Solution

The fourth proportional to 438.26, 603.64 and 405.41 is: 558.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.26 : 603.64 = 405.41 : x
  2. Step 2: Convert to fraction form
    438.26/603.64 = 405.41/x
  3. Step 3: Cross multiply
    438.26x = 603.64 × 405.41
  4. Step 4: Simplify right side
    438.26x = 244,716.90
  5. Step 5: Solve for x
    x = 244,716.90/438.26
  6. Step 6: Final answer
    x = 558.38

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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.