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Finding the Fourth Proportional to 57,786.36, 79,783.44 and 38,690.64

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Solution

The fourth proportional to 57,786.36, 79,783.44 and 38,690.64 is: 53,418.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,786.36 : 79,783.44 = 38,690.64 : x
  2. Step 2: Convert to fraction form
    57,786.36/79,783.44 = 38,690.64/x
  3. Step 3: Cross multiply
    57,786.36x = 79,783.44 × 38,690.64
  4. Step 4: Simplify right side
    57,786.36x = 3,086,872,355.00
  5. Step 5: Solve for x
    x = 3,086,872,355.00/57,786.36
  6. Step 6: Final answer
    x = 53,418.70

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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.