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Finding the Fourth Proportional to 389.33, 581.23 and 330.94

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Solution

The fourth proportional to 389.33, 581.23 and 330.94 is: 494.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.33 : 581.23 = 330.94 : x
  2. Step 2: Convert to fraction form
    389.33/581.23 = 330.94/x
  3. Step 3: Cross multiply
    389.33x = 581.23 × 330.94
  4. Step 4: Simplify right side
    389.33x = 192,348.27
  5. Step 5: Solve for x
    x = 192,348.27/389.33
  6. Step 6: Final answer
    x = 494.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.