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Finding the Fourth Proportional to 8,072.80, 12,109.20 and 4,386.40

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Solution

The fourth proportional to 8,072.80, 12,109.20 and 4,386.40 is: 6,579.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,072.80 : 12,109.20 = 4,386.40 : x
  2. Step 2: Convert to fraction form
    8,072.80/12,109.20 = 4,386.40/x
  3. Step 3: Cross multiply
    8,072.80x = 12,109.20 × 4,386.40
  4. Step 4: Simplify right side
    8,072.80x = 53,115,794.88
  5. Step 5: Solve for x
    x = 53,115,794.88/8,072.80
  6. Step 6: Final answer
    x = 6,579.60

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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.