Home / 2,815.12-4,222.44-763.12

Finding the Fourth Proportional to 2,815.12, 4,222.44 and 763.12

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Solution

The fourth proportional to 2,815.12, 4,222.44 and 763.12 is: 1,144.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.12 : 4,222.44 = 763.12 : x
  2. Step 2: Convert to fraction form
    2,815.12/4,222.44 = 763.12/x
  3. Step 3: Cross multiply
    2,815.12x = 4,222.44 × 763.12
  4. Step 4: Simplify right side
    2,815.12x = 3,222,228.41
  5. Step 5: Solve for x
    x = 3,222,228.41/2,815.12
  6. Step 6: Final answer
    x = 1,144.61

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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.