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Finding the Fourth Proportional to 221.03, 330.93 and 139.62

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Solution

The fourth proportional to 221.03, 330.93 and 139.62 is: 209.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.03 : 330.93 = 139.62 : x
  2. Step 2: Convert to fraction form
    221.03/330.93 = 139.62/x
  3. Step 3: Cross multiply
    221.03x = 330.93 × 139.62
  4. Step 4: Simplify right side
    221.03x = 46,204.45
  5. Step 5: Solve for x
    x = 46,204.45/221.03
  6. Step 6: Final answer
    x = 209.05

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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.