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Finding the Fourth Proportional to 69,815.20, 104,722.80 and 54,068.80

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Solution

The fourth proportional to 69,815.20, 104,722.80 and 54,068.80 is: 81,103.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,815.20 : 104,722.80 = 54,068.80 : x
  2. Step 2: Convert to fraction form
    69,815.20/104,722.80 = 54,068.80/x
  3. Step 3: Cross multiply
    69,815.20x = 104,722.80 × 54,068.80
  4. Step 4: Simplify right side
    69,815.20x = 5,662,236,128.64
  5. Step 5: Solve for x
    x = 5,662,236,128.64/69,815.20
  6. Step 6: Final answer
    x = 81,103.20

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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.