Home / 3,121.50-4,311.33-2,071.74

Finding the Fourth Proportional to 3,121.50, 4,311.33 and 2,071.74

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Solution

The fourth proportional to 3,121.50, 4,311.33 and 2,071.74 is: 2,861.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.50 : 4,311.33 = 2,071.74 : x
  2. Step 2: Convert to fraction form
    3,121.50/4,311.33 = 2,071.74/x
  3. Step 3: Cross multiply
    3,121.50x = 4,311.33 × 2,071.74
  4. Step 4: Simplify right side
    3,121.50x = 8,931,954.81
  5. Step 5: Solve for x
    x = 8,931,954.81/3,121.50
  6. Step 6: Final answer
    x = 2,861.43

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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.