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Finding the Fourth Proportional to 380.40, 523.80 and 359.04

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Solution

The fourth proportional to 380.40, 523.80 and 359.04 is: 494.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.40 : 523.80 = 359.04 : x
  2. Step 2: Convert to fraction form
    380.40/523.80 = 359.04/x
  3. Step 3: Cross multiply
    380.40x = 523.80 × 359.04
  4. Step 4: Simplify right side
    380.40x = 188,065.15
  5. Step 5: Solve for x
    x = 188,065.15/380.40
  6. Step 6: Final answer
    x = 494.39

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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.