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Finding the Fourth Proportional to 643,849.20, 965,773.80 and 405,903.60

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Solution

The fourth proportional to 643,849.20, 965,773.80 and 405,903.60 is: 608,855.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,849.20 : 965,773.80 = 405,903.60 : x
  2. Step 2: Convert to fraction form
    643,849.20/965,773.80 = 405,903.60/x
  3. Step 3: Cross multiply
    643,849.20x = 965,773.80 × 405,903.60
  4. Step 4: Simplify right side
    643,849.20x = 392,011,062,205.68
  5. Step 5: Solve for x
    x = 392,011,062,205.68/643,849.20
  6. Step 6: Final answer
    x = 608,855.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.