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Finding the Fourth Proportional to 643,662.55, 888,195.46 and 381,972.81

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Solution

The fourth proportional to 643,662.55, 888,195.46 and 381,972.81 is: 527,087.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,662.55 : 888,195.46 = 381,972.81 : x
  2. Step 2: Convert to fraction form
    643,662.55/888,195.46 = 381,972.81/x
  3. Step 3: Cross multiply
    643,662.55x = 888,195.46 × 381,972.81
  4. Step 4: Simplify right side
    643,662.55x = 339,266,513,775.58
  5. Step 5: Solve for x
    x = 339,266,513,775.58/643,662.55
  6. Step 6: Final answer
    x = 527,087.55

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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.