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Finding the Fourth Proportional to 3,859.70, 5,789.61 and 1,392.80

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Solution

The fourth proportional to 3,859.70, 5,789.61 and 1,392.80 is: 2,089.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,859.70 : 5,789.61 = 1,392.80 : x
  2. Step 2: Convert to fraction form
    3,859.70/5,789.61 = 1,392.80/x
  3. Step 3: Cross multiply
    3,859.70x = 5,789.61 × 1,392.80
  4. Step 4: Simplify right side
    3,859.70x = 8,063,739.86
  5. Step 5: Solve for x
    x = 8,063,739.86/3,859.70
  6. Step 6: Final answer
    x = 2,089.22

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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.