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Finding the Fourth Proportional to 389.70, 583.98 and 206.73

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Solution

The fourth proportional to 389.70, 583.98 and 206.73 is: 309.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.70 : 583.98 = 206.73 : x
  2. Step 2: Convert to fraction form
    389.70/583.98 = 206.73/x
  3. Step 3: Cross multiply
    389.70x = 583.98 × 206.73
  4. Step 4: Simplify right side
    389.70x = 120,726.19
  5. Step 5: Solve for x
    x = 120,726.19/389.70
  6. Step 6: Final answer
    x = 309.79

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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.