Home / 2,279.12-3,145.20-1,284.30

Finding the Fourth Proportional to 2,279.12, 3,145.20 and 1,284.30

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Solution

The fourth proportional to 2,279.12, 3,145.20 and 1,284.30 is: 1,772.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,279.12 : 3,145.20 = 1,284.30 : x
  2. Step 2: Convert to fraction form
    2,279.12/3,145.20 = 1,284.30/x
  3. Step 3: Cross multiply
    2,279.12x = 3,145.20 × 1,284.30
  4. Step 4: Simplify right side
    2,279.12x = 4,039,380.36
  5. Step 5: Solve for x
    x = 4,039,380.36/2,279.12
  6. Step 6: Final answer
    x = 1,772.35

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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.