Home / 11,989.55-17,990.40-8,085.75

Finding the Fourth Proportional to 11,989.55, 17,990.40 and 8,085.75

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Solution

The fourth proportional to 11,989.55, 17,990.40 and 8,085.75 is: 12,132.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,989.55 : 17,990.40 = 8,085.75 : x
  2. Step 2: Convert to fraction form
    11,989.55/17,990.40 = 8,085.75/x
  3. Step 3: Cross multiply
    11,989.55x = 17,990.40 × 8,085.75
  4. Step 4: Simplify right side
    11,989.55x = 145,465,876.80
  5. Step 5: Solve for x
    x = 145,465,876.80/11,989.55
  6. Step 6: Final answer
    x = 12,132.73

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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.