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Finding the Fourth Proportional to 69,815.20, 104,722.80 and 68,778.40

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Solution

The fourth proportional to 69,815.20, 104,722.80 and 68,778.40 is: 103,167.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,815.20 : 104,722.80 = 68,778.40 : x
  2. Step 2: Convert to fraction form
    69,815.20/104,722.80 = 68,778.40/x
  3. Step 3: Cross multiply
    69,815.20x = 104,722.80 × 68,778.40
  4. Step 4: Simplify right side
    69,815.20x = 7,202,666,627.52
  5. Step 5: Solve for x
    x = 7,202,666,627.52/69,815.20
  6. Step 6: Final answer
    x = 103,167.60

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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.