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Finding the Fourth Proportional to 3,859.60, 5,785.88 and 1,393.86

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Solution

The fourth proportional to 3,859.60, 5,785.88 and 1,393.86 is: 2,089.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,859.60 : 5,785.88 = 1,393.86 : x
  2. Step 2: Convert to fraction form
    3,859.60/5,785.88 = 1,393.86/x
  3. Step 3: Cross multiply
    3,859.60x = 5,785.88 × 1,393.86
  4. Step 4: Simplify right side
    3,859.60x = 8,064,706.70
  5. Step 5: Solve for x
    x = 8,064,706.70/3,859.60
  6. Step 6: Final answer
    x = 2,089.52

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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.