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Finding the Fourth Proportional to 664,969.10, 917,658.39 and 378,489.20

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Solution

The fourth proportional to 664,969.10, 917,658.39 and 378,489.20 is: 522,315.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,969.10 : 917,658.39 = 378,489.20 : x
  2. Step 2: Convert to fraction form
    664,969.10/917,658.39 = 378,489.20/x
  3. Step 3: Cross multiply
    664,969.10x = 917,658.39 × 378,489.20
  4. Step 4: Simplify right side
    664,969.10x = 347,323,785,316.10
  5. Step 5: Solve for x
    x = 347,323,785,316.10/664,969.10
  6. Step 6: Final answer
    x = 522,315.68

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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.