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Finding the Fourth Proportional to 8,779.80, 13,169.70 and 8,439.60

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Solution

The fourth proportional to 8,779.80, 13,169.70 and 8,439.60 is: 12,659.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,779.80 : 13,169.70 = 8,439.60 : x
  2. Step 2: Convert to fraction form
    8,779.80/13,169.70 = 8,439.60/x
  3. Step 3: Cross multiply
    8,779.80x = 13,169.70 × 8,439.60
  4. Step 4: Simplify right side
    8,779.80x = 111,147,000.12
  5. Step 5: Solve for x
    x = 111,147,000.12/8,779.80
  6. Step 6: Final answer
    x = 12,659.40

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Similar ratio
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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.