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Finding the Fourth Proportional to 321.99, 483.08 and 139.41

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Solution

The fourth proportional to 321.99, 483.08 and 139.41 is: 209.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.99 : 483.08 = 139.41 : x
  2. Step 2: Convert to fraction form
    321.99/483.08 = 139.41/x
  3. Step 3: Cross multiply
    321.99x = 483.08 × 139.41
  4. Step 4: Simplify right side
    321.99x = 67,345.49
  5. Step 5: Solve for x
    x = 67,345.49/321.99
  6. Step 6: Final answer
    x = 209.15

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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.