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Finding the Fourth Proportional to 111,211.40, 166,817.10 and 66,815.30

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Solution

The fourth proportional to 111,211.40, 166,817.10 and 66,815.30 is: 100,222.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,211.40 : 166,817.10 = 66,815.30 : x
  2. Step 2: Convert to fraction form
    111,211.40/166,817.10 = 66,815.30/x
  3. Step 3: Cross multiply
    111,211.40x = 166,817.10 × 66,815.30
  4. Step 4: Simplify right side
    111,211.40x = 11,145,934,581.63
  5. Step 5: Solve for x
    x = 11,145,934,581.63/111,211.40
  6. Step 6: Final answer
    x = 100,222.95

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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.