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Finding the Fourth Proportional to 38,674.40, 57,934.80 and 21,112.80

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Solution

The fourth proportional to 38,674.40, 57,934.80 and 21,112.80 is: 31,627.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,674.40 : 57,934.80 = 21,112.80 : x
  2. Step 2: Convert to fraction form
    38,674.40/57,934.80 = 21,112.80/x
  3. Step 3: Cross multiply
    38,674.40x = 57,934.80 × 21,112.80
  4. Step 4: Simplify right side
    38,674.40x = 1,223,165,845.44
  5. Step 5: Solve for x
    x = 1,223,165,845.44/38,674.40
  6. Step 6: Final answer
    x = 31,627.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.