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Finding the Fourth Proportional to 726,701.60, 1,087,978.80 and 643,757.60

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Solution

The fourth proportional to 726,701.60, 1,087,978.80 and 643,757.60 is: 963,799.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    726,701.60 : 1,087,978.80 = 643,757.60 : x
  2. Step 2: Convert to fraction form
    726,701.60/1,087,978.80 = 643,757.60/x
  3. Step 3: Cross multiply
    726,701.60x = 1,087,978.80 × 643,757.60
  4. Step 4: Simplify right side
    726,701.60x = 700,394,621,138.88
  5. Step 5: Solve for x
    x = 700,394,621,138.88/726,701.60
  6. Step 6: Final answer
    x = 963,799.48

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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.