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Finding the Fourth Proportional to 12,485.40, 18,703.80 and 6,928.80

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Solution

The fourth proportional to 12,485.40, 18,703.80 and 6,928.80 is: 10,379.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,485.40 : 18,703.80 = 6,928.80 : x
  2. Step 2: Convert to fraction form
    12,485.40/18,703.80 = 6,928.80/x
  3. Step 3: Cross multiply
    12,485.40x = 18,703.80 × 6,928.80
  4. Step 4: Simplify right side
    12,485.40x = 129,594,889.44
  5. Step 5: Solve for x
    x = 129,594,889.44/12,485.40
  6. Step 6: Final answer
    x = 10,379.71

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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.