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Finding the Fourth Proportional to 438.12, 604.32 and 379.80

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Solution

The fourth proportional to 438.12, 604.32 and 379.80 is: 523.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.12 : 604.32 = 379.80 : x
  2. Step 2: Convert to fraction form
    438.12/604.32 = 379.80/x
  3. Step 3: Cross multiply
    438.12x = 604.32 × 379.80
  4. Step 4: Simplify right side
    438.12x = 229,520.74
  5. Step 5: Solve for x
    x = 229,520.74/438.12
  6. Step 6: Final answer
    x = 523.88

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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.