Home / 3,918.85-5,878.47-1,286.62

Finding the Fourth Proportional to 3,918.85, 5,878.47 and 1,286.62

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Solution

The fourth proportional to 3,918.85, 5,878.47 and 1,286.62 is: 1,929.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.85 : 5,878.47 = 1,286.62 : x
  2. Step 2: Convert to fraction form
    3,918.85/5,878.47 = 1,286.62/x
  3. Step 3: Cross multiply
    3,918.85x = 5,878.47 × 1,286.62
  4. Step 4: Simplify right side
    3,918.85x = 7,563,347.20
  5. Step 5: Solve for x
    x = 7,563,347.20/3,918.85
  6. Step 6: Final answer
    x = 1,929.99

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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.