Home / 3,121.92-4,679.28-1,172.16

Finding the Fourth Proportional to 3,121.92, 4,679.28 and 1,172.16

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Solution

The fourth proportional to 3,121.92, 4,679.28 and 1,172.16 is: 1,756.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.92 : 4,679.28 = 1,172.16 : x
  2. Step 2: Convert to fraction form
    3,121.92/4,679.28 = 1,172.16/x
  3. Step 3: Cross multiply
    3,121.92x = 4,679.28 × 1,172.16
  4. Step 4: Simplify right side
    3,121.92x = 5,484,864.84
  5. Step 5: Solve for x
    x = 5,484,864.84/3,121.92
  6. Step 6: Final answer
    x = 1,756.89

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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.