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Finding the Fourth Proportional to 8,406.20, 12,609.48 and 3,789.20

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Solution

The fourth proportional to 8,406.20, 12,609.48 and 3,789.20 is: 5,683.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,406.20 : 12,609.48 = 3,789.20 : x
  2. Step 2: Convert to fraction form
    8,406.20/12,609.48 = 3,789.20/x
  3. Step 3: Cross multiply
    8,406.20x = 12,609.48 × 3,789.20
  4. Step 4: Simplify right side
    8,406.20x = 47,779,841.62
  5. Step 5: Solve for x
    x = 47,779,841.62/8,406.20
  6. Step 6: Final answer
    x = 5,683.88

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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.