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Finding the Fourth Proportional to 643,355.30, 887,936.78 and 356,967.66

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Solution

The fourth proportional to 643,355.30, 887,936.78 and 356,967.66 is: 492,674.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,355.30 : 887,936.78 = 356,967.66 : x
  2. Step 2: Convert to fraction form
    643,355.30/887,936.78 = 356,967.66/x
  3. Step 3: Cross multiply
    643,355.30x = 887,936.78 × 356,967.66
  4. Step 4: Simplify right side
    643,355.30x = 316,964,714,584.54
  5. Step 5: Solve for x
    x = 316,964,714,584.54/643,355.30
  6. Step 6: Final answer
    x = 492,674.44

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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.