Home / 8,139.48-12,207.36-3,920.57

Finding the Fourth Proportional to 8,139.48, 12,207.36 and 3,920.57

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Solution

The fourth proportional to 8,139.48, 12,207.36 and 3,920.57 is: 5,879.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.48 : 12,207.36 = 3,920.57 : x
  2. Step 2: Convert to fraction form
    8,139.48/12,207.36 = 3,920.57/x
  3. Step 3: Cross multiply
    8,139.48x = 12,207.36 × 3,920.57
  4. Step 4: Simplify right side
    8,139.48x = 47,859,814.85
  5. Step 5: Solve for x
    x = 47,859,814.85/8,139.48
  6. Step 6: Final answer
    x = 5,879.96

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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.