Home / 3,121.76-4,307.80-1,724.60

Finding the Fourth Proportional to 3,121.76, 4,307.80 and 1,724.60

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Solution

The fourth proportional to 3,121.76, 4,307.80 and 1,724.60 is: 2,379.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.76 : 4,307.80 = 1,724.60 : x
  2. Step 2: Convert to fraction form
    3,121.76/4,307.80 = 1,724.60/x
  3. Step 3: Cross multiply
    3,121.76x = 4,307.80 × 1,724.60
  4. Step 4: Simplify right side
    3,121.76x = 7,429,231.88
  5. Step 5: Solve for x
    x = 7,429,231.88/3,121.76
  6. Step 6: Final answer
    x = 2,379.82

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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.