Home / 76,939.88-115,408.62-39,478.34

Finding the Fourth Proportional to 76,939.88, 115,408.62 and 39,478.34

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Solution

The fourth proportional to 76,939.88, 115,408.62 and 39,478.34 is: 59,216.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,939.88 : 115,408.62 = 39,478.34 : x
  2. Step 2: Convert to fraction form
    76,939.88/115,408.62 = 39,478.34/x
  3. Step 3: Cross multiply
    76,939.88x = 115,408.62 × 39,478.34
  4. Step 4: Simplify right side
    76,939.88x = 4,556,140,739.29
  5. Step 5: Solve for x
    x = 4,556,140,739.29/76,939.88
  6. Step 6: Final answer
    x = 59,216.89

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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.