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Finding the Fourth Proportional to 8,326.60, 12,489.96 and 3,128.80

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Solution

The fourth proportional to 8,326.60, 12,489.96 and 3,128.80 is: 4,693.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,326.60 : 12,489.96 = 3,128.80 : x
  2. Step 2: Convert to fraction form
    8,326.60/12,489.96 = 3,128.80/x
  3. Step 3: Cross multiply
    8,326.60x = 12,489.96 × 3,128.80
  4. Step 4: Simplify right side
    8,326.60x = 39,078,586.85
  5. Step 5: Solve for x
    x = 39,078,586.85/8,326.60
  6. Step 6: Final answer
    x = 4,693.22

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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.