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Finding the Fourth Proportional to 380.09, 523.77 and 321.77

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Solution

The fourth proportional to 380.09, 523.77 and 321.77 is: 443.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.09 : 523.77 = 321.77 : x
  2. Step 2: Convert to fraction form
    380.09/523.77 = 321.77/x
  3. Step 3: Cross multiply
    380.09x = 523.77 × 321.77
  4. Step 4: Simplify right side
    380.09x = 168,533.58
  5. Step 5: Solve for x
    x = 168,533.58/380.09
  6. Step 6: Final answer
    x = 443.40

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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.