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Finding the Fourth Proportional to 322.19, 483.39 and 139.49

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Solution

The fourth proportional to 322.19, 483.39 and 139.49 is: 209.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.19 : 483.39 = 139.49 : x
  2. Step 2: Convert to fraction form
    322.19/483.39 = 139.49/x
  3. Step 3: Cross multiply
    322.19x = 483.39 × 139.49
  4. Step 4: Simplify right side
    322.19x = 67,425.65
  5. Step 5: Solve for x
    x = 67,425.65/322.19
  6. Step 6: Final answer
    x = 209.28

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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.