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Finding the Fourth Proportional to 643,918.07, 888,562.46 and 357,415.61

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Solution

The fourth proportional to 643,918.07, 888,562.46 and 357,415.61 is: 493,208.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,918.07 : 888,562.46 = 357,415.61 : x
  2. Step 2: Convert to fraction form
    643,918.07/888,562.46 = 357,415.61/x
  3. Step 3: Cross multiply
    643,918.07x = 888,562.46 × 357,415.61
  4. Step 4: Simplify right side
    643,918.07x = 317,586,090,114.73
  5. Step 5: Solve for x
    x = 317,586,090,114.73/643,918.07
  6. Step 6: Final answer
    x = 493,208.85

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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.