Home / 13,121.80-19,682.70-8,456.20

Finding the Fourth Proportional to 13,121.80, 19,682.70 and 8,456.20

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Solution

The fourth proportional to 13,121.80, 19,682.70 and 8,456.20 is: 12,684.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.80 : 19,682.70 = 8,456.20 : x
  2. Step 2: Convert to fraction form
    13,121.80/19,682.70 = 8,456.20/x
  3. Step 3: Cross multiply
    13,121.80x = 19,682.70 × 8,456.20
  4. Step 4: Simplify right side
    13,121.80x = 166,440,847.74
  5. Step 5: Solve for x
    x = 166,440,847.74/13,121.80
  6. Step 6: Final answer
    x = 12,684.30

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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.