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Finding the Fourth Proportional to 31,843.74, 43,939.46 and 18,412.40

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Solution

The fourth proportional to 31,843.74, 43,939.46 and 18,412.40 is: 25,406.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,843.74 : 43,939.46 = 18,412.40 : x
  2. Step 2: Convert to fraction form
    31,843.74/43,939.46 = 18,412.40/x
  3. Step 3: Cross multiply
    31,843.74x = 43,939.46 × 18,412.40
  4. Step 4: Simplify right side
    31,843.74x = 809,030,913.30
  5. Step 5: Solve for x
    x = 809,030,913.30/31,843.74
  6. Step 6: Final answer
    x = 25,406.28

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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.