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Finding the Fourth Proportional to 643,912.94, 888,555.40 and 357,410.47

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Solution

The fourth proportional to 643,912.94, 888,555.40 and 357,410.47 is: 493,201.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,912.94 : 888,555.40 = 357,410.47 : x
  2. Step 2: Convert to fraction form
    643,912.94/888,555.40 = 357,410.47/x
  3. Step 3: Cross multiply
    643,912.94x = 888,555.40 × 357,410.47
  4. Step 4: Simplify right side
    643,912.94x = 317,579,003,135.04
  5. Step 5: Solve for x
    x = 317,579,003,135.04/643,912.94
  6. Step 6: Final answer
    x = 493,201.78

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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.