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Finding the Fourth Proportional to 389.60, 584.39 and 115.69

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Solution

The fourth proportional to 389.60, 584.39 and 115.69 is: 173.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.60 : 584.39 = 115.69 : x
  2. Step 2: Convert to fraction form
    389.60/584.39 = 115.69/x
  3. Step 3: Cross multiply
    389.60x = 584.39 × 115.69
  4. Step 4: Simplify right side
    389.60x = 67,608.23
  5. Step 5: Solve for x
    x = 67,608.23/389.60
  6. Step 6: Final answer
    x = 173.53

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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.