Home / 12,309.12-16,986.48-6,720

Finding the Fourth Proportional to 12,309.12, 16,986.48 and 6,720

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Solution

The fourth proportional to 12,309.12, 16,986.48 and 6,720 is: 9,273.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,309.12 : 16,986.48 = 6,720 : x
  2. Step 2: Convert to fraction form
    12,309.12/16,986.48 = 6,720/x
  3. Step 3: Cross multiply
    12,309.12x = 16,986.48 × 6,720
  4. Step 4: Simplify right side
    12,309.12x = 114,149,145.60
  5. Step 5: Solve for x
    x = 114,149,145.60/12,309.12
  6. Step 6: Final answer
    x = 9,273.54

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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.