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Finding the Fourth Proportional to 38,600.64, 57,921.12 and 21,067.20

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Solution

The fourth proportional to 38,600.64, 57,921.12 and 21,067.20 is: 31,611.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,600.64 : 57,921.12 = 21,067.20 : x
  2. Step 2: Convert to fraction form
    38,600.64/57,921.12 = 21,067.20/x
  3. Step 3: Cross multiply
    38,600.64x = 57,921.12 × 21,067.20
  4. Step 4: Simplify right side
    38,600.64x = 1,220,235,819.26
  5. Step 5: Solve for x
    x = 1,220,235,819.26/38,600.64
  6. Step 6: Final answer
    x = 31,611.80

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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.