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Finding the Fourth Proportional to 389.41, 584.04 and 115.49

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Solution

The fourth proportional to 389.41, 584.04 and 115.49 is: 173.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.41 : 584.04 = 115.49 : x
  2. Step 2: Convert to fraction form
    389.41/584.04 = 115.49/x
  3. Step 3: Cross multiply
    389.41x = 584.04 × 115.49
  4. Step 4: Simplify right side
    389.41x = 67,450.78
  5. Step 5: Solve for x
    x = 67,450.78/389.41
  6. Step 6: Final answer
    x = 173.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.