Home / 20,122.10-30,183.15-12,686.30

Finding the Fourth Proportional to 20,122.10, 30,183.15 and 12,686.30

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Solution

The fourth proportional to 20,122.10, 30,183.15 and 12,686.30 is: 19,029.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,122.10 : 30,183.15 = 12,686.30 : x
  2. Step 2: Convert to fraction form
    20,122.10/30,183.15 = 12,686.30/x
  3. Step 3: Cross multiply
    20,122.10x = 30,183.15 × 12,686.30
  4. Step 4: Simplify right side
    20,122.10x = 382,912,495.85
  5. Step 5: Solve for x
    x = 382,912,495.85/20,122.10
  6. Step 6: Final answer
    x = 19,029.45

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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.