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Finding the Fourth Proportional to 76,940.40, 115,410.60 and 72,639.60

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Solution

The fourth proportional to 76,940.40, 115,410.60 and 72,639.60 is: 108,959.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,940.40 : 115,410.60 = 72,639.60 : x
  2. Step 2: Convert to fraction form
    76,940.40/115,410.60 = 72,639.60/x
  3. Step 3: Cross multiply
    76,940.40x = 115,410.60 × 72,639.60
  4. Step 4: Simplify right side
    76,940.40x = 8,383,379,819.76
  5. Step 5: Solve for x
    x = 8,383,379,819.76/76,940.40
  6. Step 6: Final answer
    x = 108,959.40

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1.5x scale

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.