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Finding the Fourth Proportional to 389.79, 584.75 and 115.89

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Solution

The fourth proportional to 389.79, 584.75 and 115.89 is: 173.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.79 : 584.75 = 115.89 : x
  2. Step 2: Convert to fraction form
    389.79/584.75 = 115.89/x
  3. Step 3: Cross multiply
    389.79x = 584.75 × 115.89
  4. Step 4: Simplify right side
    389.79x = 67,766.68
  5. Step 5: Solve for x
    x = 67,766.68/389.79
  6. Step 6: Final answer
    x = 173.85

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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.