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Finding the Fourth Proportional to 2,990.75, 4,478.31 and 2,520.98

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Solution

The fourth proportional to 2,990.75, 4,478.31 and 2,520.98 is: 3,774.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.75 : 4,478.31 = 2,520.98 : x
  2. Step 2: Convert to fraction form
    2,990.75/4,478.31 = 2,520.98/x
  3. Step 3: Cross multiply
    2,990.75x = 4,478.31 × 2,520.98
  4. Step 4: Simplify right side
    2,990.75x = 11,289,729.94
  5. Step 5: Solve for x
    x = 11,289,729.94/2,990.75
  6. Step 6: Final answer
    x = 3,774.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.