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Finding the Fourth Proportional to 217,722.20, 300,435.90 and 122,207

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Solution

The fourth proportional to 217,722.20, 300,435.90 and 122,207 is: 168,634.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,722.20 : 300,435.90 = 122,207 : x
  2. Step 2: Convert to fraction form
    217,722.20/300,435.90 = 122,207/x
  3. Step 3: Cross multiply
    217,722.20x = 300,435.90 × 122,207
  4. Step 4: Simplify right side
    217,722.20x = 36,715,370,031.30
  5. Step 5: Solve for x
    x = 36,715,370,031.30/217,722.20
  6. Step 6: Final answer
    x = 168,634.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.