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Finding the Fourth Proportional to 3,090.84, 4,264.11 and 1,909.86

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Solution

The fourth proportional to 3,090.84, 4,264.11 and 1,909.86 is: 2,634.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,090.84 : 4,264.11 = 1,909.86 : x
  2. Step 2: Convert to fraction form
    3,090.84/4,264.11 = 1,909.86/x
  3. Step 3: Cross multiply
    3,090.84x = 4,264.11 × 1,909.86
  4. Step 4: Simplify right side
    3,090.84x = 8,143,853.12
  5. Step 5: Solve for x
    x = 8,143,853.12/3,090.84
  6. Step 6: Final answer
    x = 2,634.83

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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.