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Finding the Fourth Proportional to 389.49, 584.24 and 115.59

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Solution

The fourth proportional to 389.49, 584.24 and 115.59 is: 173.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.49 : 584.24 = 115.59 : x
  2. Step 2: Convert to fraction form
    389.49/584.24 = 115.59/x
  3. Step 3: Cross multiply
    389.49x = 584.24 × 115.59
  4. Step 4: Simplify right side
    389.49x = 67,532.30
  5. Step 5: Solve for x
    x = 67,532.30/389.49
  6. Step 6: Final answer
    x = 173.39

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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.