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Finding the Fourth Proportional to 257,939.80, 387,122.90 and 131,673.32

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Solution

The fourth proportional to 257,939.80, 387,122.90 and 131,673.32 is: 197,618.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,939.80 : 387,122.90 = 131,673.32 : x
  2. Step 2: Convert to fraction form
    257,939.80/387,122.90 = 131,673.32/x
  3. Step 3: Cross multiply
    257,939.80x = 387,122.90 × 131,673.32
  4. Step 4: Simplify right side
    257,939.80x = 50,973,757,491.03
  5. Step 5: Solve for x
    x = 50,973,757,491.03/257,939.80
  6. Step 6: Final answer
    x = 197,618.81

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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.