Home / 12,909.40-19,351.86-4,139.80

Finding the Fourth Proportional to 12,909.40, 19,351.86 and 4,139.80

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Solution

The fourth proportional to 12,909.40, 19,351.86 and 4,139.80 is: 6,205.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,909.40 : 19,351.86 = 4,139.80 : x
  2. Step 2: Convert to fraction form
    12,909.40/19,351.86 = 4,139.80/x
  3. Step 3: Cross multiply
    12,909.40x = 19,351.86 × 4,139.80
  4. Step 4: Simplify right side
    12,909.40x = 80,112,830.03
  5. Step 5: Solve for x
    x = 80,112,830.03/12,909.40
  6. Step 6: Final answer
    x = 6,205.77

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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.