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Finding the Fourth Proportional to 8,390.20, 12,609.60 and 8,244.40

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Solution

The fourth proportional to 8,390.20, 12,609.60 and 8,244.40 is: 12,390.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390.20 : 12,609.60 = 8,244.40 : x
  2. Step 2: Convert to fraction form
    8,390.20/12,609.60 = 8,244.40/x
  3. Step 3: Cross multiply
    8,390.20x = 12,609.60 × 8,244.40
  4. Step 4: Simplify right side
    8,390.20x = 103,958,586.24
  5. Step 5: Solve for x
    x = 103,958,586.24/8,390.20
  6. Step 6: Final answer
    x = 12,390.48

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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.