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Finding the Fourth Proportional to 664,591.38, 917,124.36 and 378,105.32

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Solution

The fourth proportional to 664,591.38, 917,124.36 and 378,105.32 is: 521,778.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,591.38 : 917,124.36 = 378,105.32 : x
  2. Step 2: Convert to fraction form
    664,591.38/917,124.36 = 378,105.32/x
  3. Step 3: Cross multiply
    664,591.38x = 917,124.36 × 378,105.32
  4. Step 4: Simplify right side
    664,591.38x = 346,769,595,031.97
  5. Step 5: Solve for x
    x = 346,769,595,031.97/664,591.38
  6. Step 6: Final answer
    x = 521,778.65

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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.