Home / 7,872.12-11,815.46-3,979.28

Finding the Fourth Proportional to 7,872.12, 11,815.46 and 3,979.28

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Solution

The fourth proportional to 7,872.12, 11,815.46 and 3,979.28 is: 5,972.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,872.12 : 11,815.46 = 3,979.28 : x
  2. Step 2: Convert to fraction form
    7,872.12/11,815.46 = 3,979.28/x
  3. Step 3: Cross multiply
    7,872.12x = 11,815.46 × 3,979.28
  4. Step 4: Simplify right side
    7,872.12x = 47,017,023.67
  5. Step 5: Solve for x
    x = 47,017,023.67/7,872.12
  6. Step 6: Final answer
    x = 5,972.60

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1.5x scale

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.