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Finding the Fourth Proportional to 76,901.80, 115,401.30 and 45,311.80

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Solution

The fourth proportional to 76,901.80, 115,401.30 and 45,311.80 is: 67,996.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,901.80 : 115,401.30 = 45,311.80 : x
  2. Step 2: Convert to fraction form
    76,901.80/115,401.30 = 45,311.80/x
  3. Step 3: Cross multiply
    76,901.80x = 115,401.30 × 45,311.80
  4. Step 4: Simplify right side
    76,901.80x = 5,229,040,625.34
  5. Step 5: Solve for x
    x = 5,229,040,625.34/76,901.80
  6. Step 6: Final answer
    x = 67,996.34

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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.