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Finding the Fourth Proportional to 2,990.85, 4,126.86 and 2,748.90

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Solution

The fourth proportional to 2,990.85, 4,126.86 and 2,748.90 is: 3,793.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.85 : 4,126.86 = 2,748.90 : x
  2. Step 2: Convert to fraction form
    2,990.85/4,126.86 = 2,748.90/x
  3. Step 3: Cross multiply
    2,990.85x = 4,126.86 × 2,748.90
  4. Step 4: Simplify right side
    2,990.85x = 11,344,325.45
  5. Step 5: Solve for x
    x = 11,344,325.45/2,990.85
  6. Step 6: Final answer
    x = 3,793.01

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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.