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Finding the Fourth Proportional to 3,909.99, 5,395.80 and 2,141.61

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Solution

The fourth proportional to 3,909.99, 5,395.80 and 2,141.61 is: 2,955.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.99 : 5,395.80 = 2,141.61 : x
  2. Step 2: Convert to fraction form
    3,909.99/5,395.80 = 2,141.61/x
  3. Step 3: Cross multiply
    3,909.99x = 5,395.80 × 2,141.61
  4. Step 4: Simplify right side
    3,909.99x = 11,555,699.24
  5. Step 5: Solve for x
    x = 11,555,699.24/3,909.99
  6. Step 6: Final answer
    x = 2,955.43

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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.