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Finding the Fourth Proportional to 39,992.96, 55,078 and 39,120.96

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Solution

The fourth proportional to 39,992.96, 55,078 and 39,120.96 is: 53,877.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,992.96 : 55,078 = 39,120.96 : x
  2. Step 2: Convert to fraction form
    39,992.96/55,078 = 39,120.96/x
  3. Step 3: Cross multiply
    39,992.96x = 55,078 × 39,120.96
  4. Step 4: Simplify right side
    39,992.96x = 2,154,704,234.88
  5. Step 5: Solve for x
    x = 2,154,704,234.88/39,992.96
  6. Step 6: Final answer
    x = 53,877.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.