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Finding the Fourth Proportional to 3,855.41, 5,781.93 and 1,389.92

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Solution

The fourth proportional to 3,855.41, 5,781.93 and 1,389.92 is: 2,084.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,855.41 : 5,781.93 = 1,389.92 : x
  2. Step 2: Convert to fraction form
    3,855.41/5,781.93 = 1,389.92/x
  3. Step 3: Cross multiply
    3,855.41x = 5,781.93 × 1,389.92
  4. Step 4: Simplify right side
    3,855.41x = 8,036,386.02
  5. Step 5: Solve for x
    x = 8,036,386.02/3,855.41
  6. Step 6: Final answer
    x = 2,084.44

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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.