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Finding the Fourth Proportional to 76,989.20, 107,940.40 and 76,989.20

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Solution

The fourth proportional to 76,989.20, 107,940.40 and 76,989.20 is: 107,940.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,989.20 : 107,940.40 = 76,989.20 : x
  2. Step 2: Convert to fraction form
    76,989.20/107,940.40 = 76,989.20/x
  3. Step 3: Cross multiply
    76,989.20x = 107,940.40 × 76,989.20
  4. Step 4: Simplify right side
    76,989.20x = 8,310,245,043.68
  5. Step 5: Solve for x
    x = 8,310,245,043.68/76,989.20
  6. Step 6: Final answer
    x = 107,940.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.