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Finding the Fourth Proportional to 664,725.96, 917,388.18 and 396,453.96

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Solution

The fourth proportional to 664,725.96, 917,388.18 and 396,453.96 is: 547,146.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,725.96 : 917,388.18 = 396,453.96 : x
  2. Step 2: Convert to fraction form
    664,725.96/917,388.18 = 396,453.96/x
  3. Step 3: Cross multiply
    664,725.96x = 917,388.18 × 396,453.96
  4. Step 4: Simplify right side
    664,725.96x = 363,702,176,818.19
  5. Step 5: Solve for x
    x = 363,702,176,818.19/664,725.96
  6. Step 6: Final answer
    x = 547,146.04

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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.