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Finding the Fourth Proportional to 2,890.73, 3,990.20 and 2,226.74

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Solution

The fourth proportional to 2,890.73, 3,990.20 and 2,226.74 is: 3,073.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,890.73 : 3,990.20 = 2,226.74 : x
  2. Step 2: Convert to fraction form
    2,890.73/3,990.20 = 2,226.74/x
  3. Step 3: Cross multiply
    2,890.73x = 3,990.20 × 2,226.74
  4. Step 4: Simplify right side
    2,890.73x = 8,885,106.86
  5. Step 5: Solve for x
    x = 8,885,106.86/2,890.73
  6. Step 6: Final answer
    x = 3,073.65

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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.