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Finding the Fourth Proportional to 664,969.29, 917,658.64 and 378,489.38

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Solution

The fourth proportional to 664,969.29, 917,658.64 and 378,489.38 is: 522,315.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,969.29 : 917,658.64 = 378,489.38 : x
  2. Step 2: Convert to fraction form
    664,969.29/917,658.64 = 378,489.38/x
  3. Step 3: Cross multiply
    664,969.29x = 917,658.64 × 378,489.38
  4. Step 4: Simplify right side
    664,969.29x = 347,324,045,590.06
  5. Step 5: Solve for x
    x = 347,324,045,590.06/664,969.29
  6. Step 6: Final answer
    x = 522,315.92

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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.