Home / 8,128.92-12,187.83-3,909.95

Finding the Fourth Proportional to 8,128.92, 12,187.83 and 3,909.95

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Solution

The fourth proportional to 8,128.92, 12,187.83 and 3,909.95 is: 5,862.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.92 : 12,187.83 = 3,909.95 : x
  2. Step 2: Convert to fraction form
    8,128.92/12,187.83 = 3,909.95/x
  3. Step 3: Cross multiply
    8,128.92x = 12,187.83 × 3,909.95
  4. Step 4: Simplify right side
    8,128.92x = 47,653,744.97
  5. Step 5: Solve for x
    x = 47,653,744.97/8,128.92
  6. Step 6: Final answer
    x = 5,862.25

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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.