Home / 2,828.12-4,242.60-979.78

Finding the Fourth Proportional to 2,828.12, 4,242.60 and 979.78

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Solution

The fourth proportional to 2,828.12, 4,242.60 and 979.78 is: 1,469.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,828.12 : 4,242.60 = 979.78 : x
  2. Step 2: Convert to fraction form
    2,828.12/4,242.60 = 979.78/x
  3. Step 3: Cross multiply
    2,828.12x = 4,242.60 × 979.78
  4. Step 4: Simplify right side
    2,828.12x = 4,156,814.63
  5. Step 5: Solve for x
    x = 4,156,814.63/2,828.12
  6. Step 6: Final answer
    x = 1,469.82

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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.