Home / 78,131.24-117,149.61-30,689.54

Finding the Fourth Proportional to 78,131.24, 117,149.61 and 30,689.54

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Solution

The fourth proportional to 78,131.24, 117,149.61 and 30,689.54 is: 46,015.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,131.24 : 117,149.61 = 30,689.54 : x
  2. Step 2: Convert to fraction form
    78,131.24/117,149.61 = 30,689.54/x
  3. Step 3: Cross multiply
    78,131.24x = 117,149.61 × 30,689.54
  4. Step 4: Simplify right side
    78,131.24x = 3,595,267,642.08
  5. Step 5: Solve for x
    x = 3,595,267,642.08/78,131.24
  6. Step 6: Final answer
    x = 46,015.75

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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.