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Finding the Fourth Proportional to 378,173.64, 521,890.56 and 208,418.70

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Solution

The fourth proportional to 378,173.64, 521,890.56 and 208,418.70 is: 287,623.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,173.64 : 521,890.56 = 208,418.70 : x
  2. Step 2: Convert to fraction form
    378,173.64/521,890.56 = 208,418.70/x
  3. Step 3: Cross multiply
    378,173.64x = 521,890.56 × 208,418.70
  4. Step 4: Simplify right side
    378,173.64x = 108,771,752,057.47
  5. Step 5: Solve for x
    x = 108,771,752,057.47/378,173.64
  6. Step 6: Final answer
    x = 287,623.83

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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.