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Finding the Fourth Proportional to 643,446.87, 887,690.55 and 371,321.70

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Solution

The fourth proportional to 643,446.87, 887,690.55 and 371,321.70 is: 512,270.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,446.87 : 887,690.55 = 371,321.70 : x
  2. Step 2: Convert to fraction form
    643,446.87/887,690.55 = 371,321.70/x
  3. Step 3: Cross multiply
    643,446.87x = 887,690.55 × 371,321.70
  4. Step 4: Simplify right side
    643,446.87x = 329,618,764,099.94
  5. Step 5: Solve for x
    x = 329,618,764,099.94/643,446.87
  6. Step 6: Final answer
    x = 512,270.37

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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.