Home / 3,121.12-4,307.16-1,723.87

Finding the Fourth Proportional to 3,121.12, 4,307.16 and 1,723.87

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Solution

The fourth proportional to 3,121.12, 4,307.16 and 1,723.87 is: 2,378.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.12 : 4,307.16 = 1,723.87 : x
  2. Step 2: Convert to fraction form
    3,121.12/4,307.16 = 1,723.87/x
  3. Step 3: Cross multiply
    3,121.12x = 4,307.16 × 1,723.87
  4. Step 4: Simplify right side
    3,121.12x = 7,424,983.91
  5. Step 5: Solve for x
    x = 7,424,983.91/3,121.12
  6. Step 6: Final answer
    x = 2,378.95

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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.