Home / 3,121.50-4,307.69-1,724.30

Finding the Fourth Proportional to 3,121.50, 4,307.69 and 1,724.30

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Solution

The fourth proportional to 3,121.50, 4,307.69 and 1,724.30 is: 2,379.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.50 : 4,307.69 = 1,724.30 : x
  2. Step 2: Convert to fraction form
    3,121.50/4,307.69 = 1,724.30/x
  3. Step 3: Cross multiply
    3,121.50x = 4,307.69 × 1,724.30
  4. Step 4: Simplify right side
    3,121.50x = 7,427,749.87
  5. Step 5: Solve for x
    x = 7,427,749.87/3,121.50
  6. Step 6: Final answer
    x = 2,379.55

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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.