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Finding the Fourth Proportional to 38,690.40, 57,958.80 and 21,128.80

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Solution

The fourth proportional to 38,690.40, 57,958.80 and 21,128.80 is: 31,651.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,690.40 : 57,958.80 = 21,128.80 : x
  2. Step 2: Convert to fraction form
    38,690.40/57,958.80 = 21,128.80/x
  3. Step 3: Cross multiply
    38,690.40x = 57,958.80 × 21,128.80
  4. Step 4: Simplify right side
    38,690.40x = 1,224,599,893.44
  5. Step 5: Solve for x
    x = 1,224,599,893.44/38,690.40
  6. Step 6: Final answer
    x = 31,651.26

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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.