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Finding the Fourth Proportional to 57,915, 86,885.46 and 20,474.64

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Solution

The fourth proportional to 57,915, 86,885.46 and 20,474.64 is: 30,716.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,915 : 86,885.46 = 20,474.64 : x
  2. Step 2: Convert to fraction form
    57,915/86,885.46 = 20,474.64/x
  3. Step 3: Cross multiply
    57,915x = 86,885.46 × 20,474.64
  4. Step 4: Simplify right side
    57,915x = 1,778,948,514.73
  5. Step 5: Solve for x
    x = 1,778,948,514.73/57,915
  6. Step 6: Final answer
    x = 30,716.54

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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.