Home / 7,120.20-9,825.75-4,137.70

Finding the Fourth Proportional to 7,120.20, 9,825.75 and 4,137.70

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Solution

The fourth proportional to 7,120.20, 9,825.75 and 4,137.70 is: 5,709.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.20 : 9,825.75 = 4,137.70 : x
  2. Step 2: Convert to fraction form
    7,120.20/9,825.75 = 4,137.70/x
  3. Step 3: Cross multiply
    7,120.20x = 9,825.75 × 4,137.70
  4. Step 4: Simplify right side
    7,120.20x = 40,656,005.78
  5. Step 5: Solve for x
    x = 40,656,005.78/7,120.20
  6. Step 6: Final answer
    x = 5,709.95

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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.