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Finding the Fourth Proportional to 76,939.80, 115,409.70 and 61,906.20

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Solution

The fourth proportional to 76,939.80, 115,409.70 and 61,906.20 is: 92,859.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,939.80 : 115,409.70 = 61,906.20 : x
  2. Step 2: Convert to fraction form
    76,939.80/115,409.70 = 61,906.20/x
  3. Step 3: Cross multiply
    76,939.80x = 115,409.70 × 61,906.20
  4. Step 4: Simplify right side
    76,939.80x = 7,144,575,970.14
  5. Step 5: Solve for x
    x = 7,144,575,970.14/76,939.80
  6. Step 6: Final answer
    x = 92,859.30

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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.