Home / 3,878.79-5,350.46-2,815.31

Finding the Fourth Proportional to 3,878.79, 5,350.46 and 2,815.31

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Solution

The fourth proportional to 3,878.79, 5,350.46 and 2,815.31 is: 3,883.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,878.79 : 5,350.46 = 2,815.31 : x
  2. Step 2: Convert to fraction form
    3,878.79/5,350.46 = 2,815.31/x
  3. Step 3: Cross multiply
    3,878.79x = 5,350.46 × 2,815.31
  4. Step 4: Simplify right side
    3,878.79x = 15,063,172.75
  5. Step 5: Solve for x
    x = 15,063,172.75/3,878.79
  6. Step 6: Final answer
    x = 3,883.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.