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Finding the Fourth Proportional to 31,619.88, 43,639.80 and 18,190.88

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Solution

The fourth proportional to 31,619.88, 43,639.80 and 18,190.88 is: 25,105.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,619.88 : 43,639.80 = 18,190.88 : x
  2. Step 2: Convert to fraction form
    31,619.88/43,639.80 = 18,190.88/x
  3. Step 3: Cross multiply
    31,619.88x = 43,639.80 × 18,190.88
  4. Step 4: Simplify right side
    31,619.88x = 793,846,365.02
  5. Step 5: Solve for x
    x = 793,846,365.02/31,619.88
  6. Step 6: Final answer
    x = 25,105.93

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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.