Home / 12,920.20-19,380.30-3,686.20

Finding the Fourth Proportional to 12,920.20, 19,380.30 and 3,686.20

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Solution

The fourth proportional to 12,920.20, 19,380.30 and 3,686.20 is: 5,529.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,920.20 : 19,380.30 = 3,686.20 : x
  2. Step 2: Convert to fraction form
    12,920.20/19,380.30 = 3,686.20/x
  3. Step 3: Cross multiply
    12,920.20x = 19,380.30 × 3,686.20
  4. Step 4: Simplify right side
    12,920.20x = 71,439,661.86
  5. Step 5: Solve for x
    x = 71,439,661.86/12,920.20
  6. Step 6: Final answer
    x = 5,529.30

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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.