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Finding the Fourth Proportional to 664,155.67, 916,371.78 and 388,470.64

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Solution

The fourth proportional to 664,155.67, 916,371.78 and 388,470.64 is: 535,994.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,155.67 : 916,371.78 = 388,470.64 : x
  2. Step 2: Convert to fraction form
    664,155.67/916,371.78 = 388,470.64/x
  3. Step 3: Cross multiply
    664,155.67x = 916,371.78 × 388,470.64
  4. Step 4: Simplify right side
    664,155.67x = 355,983,531,854.54
  5. Step 5: Solve for x
    x = 355,983,531,854.54/664,155.67
  6. Step 6: Final answer
    x = 535,994.12

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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.