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Finding the Fourth Proportional to 3,489.73, 4,811.15 and 2,990.21

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Solution

The fourth proportional to 3,489.73, 4,811.15 and 2,990.21 is: 4,122.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,489.73 : 4,811.15 = 2,990.21 : x
  2. Step 2: Convert to fraction form
    3,489.73/4,811.15 = 2,990.21/x
  3. Step 3: Cross multiply
    3,489.73x = 4,811.15 × 2,990.21
  4. Step 4: Simplify right side
    3,489.73x = 14,386,333.89
  5. Step 5: Solve for x
    x = 14,386,333.89/3,489.73
  6. Step 6: Final answer
    x = 4,122.48

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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.