Home / 7,121.28-10,681.20-1,927.68

Finding the Fourth Proportional to 7,121.28, 10,681.20 and 1,927.68

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Solution

The fourth proportional to 7,121.28, 10,681.20 and 1,927.68 is: 2,891.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.28 : 10,681.20 = 1,927.68 : x
  2. Step 2: Convert to fraction form
    7,121.28/10,681.20 = 1,927.68/x
  3. Step 3: Cross multiply
    7,121.28x = 10,681.20 × 1,927.68
  4. Step 4: Simplify right side
    7,121.28x = 20,589,935.62
  5. Step 5: Solve for x
    x = 20,589,935.62/7,121.28
  6. Step 6: Final answer
    x = 2,891.33

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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.