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Finding the Fourth Proportional to 321.82, 482.77 and 139.21

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Solution

The fourth proportional to 321.82, 482.77 and 139.21 is: 208.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.82 : 482.77 = 139.21 : x
  2. Step 2: Convert to fraction form
    321.82/482.77 = 139.21/x
  3. Step 3: Cross multiply
    321.82x = 482.77 × 139.21
  4. Step 4: Simplify right side
    321.82x = 67,206.41
  5. Step 5: Solve for x
    x = 67,206.41/321.82
  6. Step 6: Final answer
    x = 208.83

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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.