Home / 2,121.76-3,163.68-2,117.60

Finding the Fourth Proportional to 2,121.76, 3,163.68 and 2,117.60

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Solution

The fourth proportional to 2,121.76, 3,163.68 and 2,117.60 is: 3,157.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.76 : 3,163.68 = 2,117.60 : x
  2. Step 2: Convert to fraction form
    2,121.76/3,163.68 = 2,117.60/x
  3. Step 3: Cross multiply
    2,121.76x = 3,163.68 × 2,117.60
  4. Step 4: Simplify right side
    2,121.76x = 6,699,408.77
  5. Step 5: Solve for x
    x = 6,699,408.77/2,121.76
  6. Step 6: Final answer
    x = 3,157.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.