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Finding the Fourth Proportional to 380.49, 524.81 and 321.87

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Solution

The fourth proportional to 380.49, 524.81 and 321.87 is: 443.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.49 : 524.81 = 321.87 : x
  2. Step 2: Convert to fraction form
    380.49/524.81 = 321.87/x
  3. Step 3: Cross multiply
    380.49x = 524.81 × 321.87
  4. Step 4: Simplify right side
    380.49x = 168,919.28
  5. Step 5: Solve for x
    x = 168,919.28/380.49
  6. Step 6: Final answer
    x = 443.95

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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.