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Finding the Fourth Proportional to 57,743, 79,685.38 and 31,247

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Solution

The fourth proportional to 57,743, 79,685.38 and 31,247 is: 43,120.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,743 : 79,685.38 = 31,247 : x
  2. Step 2: Convert to fraction form
    57,743/79,685.38 = 31,247/x
  3. Step 3: Cross multiply
    57,743x = 79,685.38 × 31,247
  4. Step 4: Simplify right side
    57,743x = 2,489,929,068.86
  5. Step 5: Solve for x
    x = 2,489,929,068.86/57,743
  6. Step 6: Final answer
    x = 43,120.88

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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.