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Finding the Fourth Proportional to 643,196.40, 887,664.16 and 356,808.80

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Solution

The fourth proportional to 643,196.40, 887,664.16 and 356,808.80 is: 492,425.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,196.40 : 887,664.16 = 356,808.80 : x
  2. Step 2: Convert to fraction form
    643,196.40/887,664.16 = 356,808.80/x
  3. Step 3: Cross multiply
    643,196.40x = 887,664.16 × 356,808.80
  4. Step 4: Simplify right side
    643,196.40x = 316,726,383,732.61
  5. Step 5: Solve for x
    x = 316,726,383,732.61/643,196.40
  6. Step 6: Final answer
    x = 492,425.62

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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.