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Finding the Fourth Proportional to 389.69, 584.46 and 129.65

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Solution

The fourth proportional to 389.69, 584.46 and 129.65 is: 194.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.69 : 584.46 = 129.65 : x
  2. Step 2: Convert to fraction form
    389.69/584.46 = 129.65/x
  3. Step 3: Cross multiply
    389.69x = 584.46 × 129.65
  4. Step 4: Simplify right side
    389.69x = 75,772.32
  5. Step 5: Solve for x
    x = 75,772.32/389.69
  6. Step 6: Final answer
    x = 194.45

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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.