Home / 76,780.71-115,021.62-43,399.80

Finding the Fourth Proportional to 76,780.71, 115,021.62 and 43,399.80

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Solution

The fourth proportional to 76,780.71, 115,021.62 and 43,399.80 is: 65,015.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,780.71 : 115,021.62 = 43,399.80 : x
  2. Step 2: Convert to fraction form
    76,780.71/115,021.62 = 43,399.80/x
  3. Step 3: Cross multiply
    76,780.71x = 115,021.62 × 43,399.80
  4. Step 4: Simplify right side
    76,780.71x = 4,991,915,303.68
  5. Step 5: Solve for x
    x = 4,991,915,303.68/76,780.71
  6. Step 6: Final answer
    x = 65,015.23

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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.