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Finding the Fourth Proportional to 389.39, 584.06 and 323.78

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Solution

The fourth proportional to 389.39, 584.06 and 323.78 is: 485.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.39 : 584.06 = 323.78 : x
  2. Step 2: Convert to fraction form
    389.39/584.06 = 323.78/x
  3. Step 3: Cross multiply
    389.39x = 584.06 × 323.78
  4. Step 4: Simplify right side
    389.39x = 189,106.79
  5. Step 5: Solve for x
    x = 189,106.79/389.39
  6. Step 6: Final answer
    x = 485.65

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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.