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Finding the Fourth Proportional to 438.10, 604.94 and 391.39

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Solution

The fourth proportional to 438.10, 604.94 and 391.39 is: 540.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.10 : 604.94 = 391.39 : x
  2. Step 2: Convert to fraction form
    438.10/604.94 = 391.39/x
  3. Step 3: Cross multiply
    438.10x = 604.94 × 391.39
  4. Step 4: Simplify right side
    438.10x = 236,767.47
  5. Step 5: Solve for x
    x = 236,767.47/438.10
  6. Step 6: Final answer
    x = 540.44

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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.