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Finding the Fourth Proportional to 380.61, 524.91 and 321.87

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Solution

The fourth proportional to 380.61, 524.91 and 321.87 is: 443.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.61 : 524.91 = 321.87 : x
  2. Step 2: Convert to fraction form
    380.61/524.91 = 321.87/x
  3. Step 3: Cross multiply
    380.61x = 524.91 × 321.87
  4. Step 4: Simplify right side
    380.61x = 168,952.78
  5. Step 5: Solve for x
    x = 168,952.78/380.61
  6. Step 6: Final answer
    x = 443.90

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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.