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Finding the Fourth Proportional to 3,859.30, 5,787.75 and 1,393.80

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Solution

The fourth proportional to 3,859.30, 5,787.75 and 1,393.80 is: 2,090.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,859.30 : 5,787.75 = 1,393.80 : x
  2. Step 2: Convert to fraction form
    3,859.30/5,787.75 = 1,393.80/x
  3. Step 3: Cross multiply
    3,859.30x = 5,787.75 × 1,393.80
  4. Step 4: Simplify right side
    3,859.30x = 8,066,965.95
  5. Step 5: Solve for x
    x = 8,066,965.95/3,859.30
  6. Step 6: Final answer
    x = 2,090.27

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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.