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Finding the Fourth Proportional to 389.80, 584.94 and 146.49

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Solution

The fourth proportional to 389.80, 584.94 and 146.49 is: 219.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.80 : 584.94 = 146.49 : x
  2. Step 2: Convert to fraction form
    389.80/584.94 = 146.49/x
  3. Step 3: Cross multiply
    389.80x = 584.94 × 146.49
  4. Step 4: Simplify right side
    389.80x = 85,687.86
  5. Step 5: Solve for x
    x = 85,687.86/389.80
  6. Step 6: Final answer
    x = 219.83

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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.