Home / 8,119.38-12,170.69-3,120.40

Finding the Fourth Proportional to 8,119.38, 12,170.69 and 3,120.40

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Solution

The fourth proportional to 8,119.38, 12,170.69 and 3,120.40 is: 4,677.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,119.38 : 12,170.69 = 3,120.40 : x
  2. Step 2: Convert to fraction form
    8,119.38/12,170.69 = 3,120.40/x
  3. Step 3: Cross multiply
    8,119.38x = 12,170.69 × 3,120.40
  4. Step 4: Simplify right side
    8,119.38x = 37,977,421.08
  5. Step 5: Solve for x
    x = 37,977,421.08/8,119.38
  6. Step 6: Final answer
    x = 4,677.38

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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.