Home / 2,990.18-4,121.72-2,279.76

Finding the Fourth Proportional to 2,990.18, 4,121.72 and 2,279.76

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Solution

The fourth proportional to 2,990.18, 4,121.72 and 2,279.76 is: 3,142.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.18 : 4,121.72 = 2,279.76 : x
  2. Step 2: Convert to fraction form
    2,990.18/4,121.72 = 2,279.76/x
  3. Step 3: Cross multiply
    2,990.18x = 4,121.72 × 2,279.76
  4. Step 4: Simplify right side
    2,990.18x = 9,396,532.39
  5. Step 5: Solve for x
    x = 9,396,532.39/2,990.18
  6. Step 6: Final answer
    x = 3,142.46

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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.