Home / 18,986.40-28,474.21-7,879.35

Finding the Fourth Proportional to 18,986.40, 28,474.21 and 7,879.35

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Solution

The fourth proportional to 18,986.40, 28,474.21 and 7,879.35 is: 11,816.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.40 : 28,474.21 = 7,879.35 : x
  2. Step 2: Convert to fraction form
    18,986.40/28,474.21 = 7,879.35/x
  3. Step 3: Cross multiply
    18,986.40x = 28,474.21 × 7,879.35
  4. Step 4: Simplify right side
    18,986.40x = 224,358,266.56
  5. Step 5: Solve for x
    x = 224,358,266.56/18,986.40
  6. Step 6: Final answer
    x = 11,816.79

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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.