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Finding the Fourth Proportional to 378,173.16, 521,879.22 and 208,406.88

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Solution

The fourth proportional to 378,173.16, 521,879.22 and 208,406.88 is: 287,601.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,173.16 : 521,879.22 = 208,406.88 : x
  2. Step 2: Convert to fraction form
    378,173.16/521,879.22 = 208,406.88/x
  3. Step 3: Cross multiply
    378,173.16x = 521,879.22 × 208,406.88
  4. Step 4: Simplify right side
    378,173.16x = 108,763,219,977.03
  5. Step 5: Solve for x
    x = 108,763,219,977.03/378,173.16
  6. Step 6: Final answer
    x = 287,601.64

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1.5x scale

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.