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Finding the Fourth Proportional to 38,499.60, 57,715.02 and 20,739.90

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Solution

The fourth proportional to 38,499.60, 57,715.02 and 20,739.90 is: 31,091.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,499.60 : 57,715.02 = 20,739.90 : x
  2. Step 2: Convert to fraction form
    38,499.60/57,715.02 = 20,739.90/x
  3. Step 3: Cross multiply
    38,499.60x = 57,715.02 × 20,739.90
  4. Step 4: Simplify right side
    38,499.60x = 1,197,003,743.30
  5. Step 5: Solve for x
    x = 1,197,003,743.30/38,499.60
  6. Step 6: Final answer
    x = 31,091.33

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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.