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Finding the Fourth Proportional to 285,578.72, 394,108.80 and 172,379.36

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Solution

The fourth proportional to 285,578.72, 394,108.80 and 172,379.36 is: 237,889.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,578.72 : 394,108.80 = 172,379.36 : x
  2. Step 2: Convert to fraction form
    285,578.72/394,108.80 = 172,379.36/x
  3. Step 3: Cross multiply
    285,578.72x = 394,108.80 × 172,379.36
  4. Step 4: Simplify right side
    285,578.72x = 67,936,222,714.37
  5. Step 5: Solve for x
    x = 67,936,222,714.37/285,578.72
  6. Step 6: Final answer
    x = 237,889.65

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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.