Home / 5,190.78-7,785.42-1,680.35

Finding the Fourth Proportional to 5,190.78, 7,785.42 and 1,680.35

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Solution

The fourth proportional to 5,190.78, 7,785.42 and 1,680.35 is: 2,520.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,190.78 : 7,785.42 = 1,680.35 : x
  2. Step 2: Convert to fraction form
    5,190.78/7,785.42 = 1,680.35/x
  3. Step 3: Cross multiply
    5,190.78x = 7,785.42 × 1,680.35
  4. Step 4: Simplify right side
    5,190.78x = 13,082,185.27
  5. Step 5: Solve for x
    x = 13,082,185.27/5,190.78
  6. Step 6: Final answer
    x = 2,520.27

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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.