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Finding the Fourth Proportional to 322.20, 483.18 and 139.50

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Solution

The fourth proportional to 322.20, 483.18 and 139.50 is: 209.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.20 : 483.18 = 139.50 : x
  2. Step 2: Convert to fraction form
    322.20/483.18 = 139.50/x
  3. Step 3: Cross multiply
    322.20x = 483.18 × 139.50
  4. Step 4: Simplify right side
    322.20x = 67,403.61
  5. Step 5: Solve for x
    x = 67,403.61/322.20
  6. Step 6: Final answer
    x = 209.20

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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.