Home / 491,199,778.30-678,161,610.67-312,684,391.54

Finding the Fourth Proportional to 491,199,778.30, 678,161,610.67 and 312,684,391.54

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Solution

The fourth proportional to 491,199,778.30, 678,161,610.67 and 312,684,391.54 is: 431,699,198.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,199,778.30 : 678,161,610.67 = 312,684,391.54 : x
  2. Step 2: Convert to fraction form
    491,199,778.30/678,161,610.67 = 312,684,391.54/x
  3. Step 3: Cross multiply
    491,199,778.30x = 678,161,610.67 × 312,684,391.54
  4. Step 4: Simplify right side
    491,199,778.30x = 212,050,550,598,135,328
  5. Step 5: Solve for x
    x = 212,050,550,598,135,328/491,199,778.30
  6. Step 6: Final answer
    x = 431,699,198.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.