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Finding the Fourth Proportional to 639,428.20, 959,660.70 and 618,692.20

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Solution

The fourth proportional to 639,428.20, 959,660.70 and 618,692.20 is: 928,539.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,428.20 : 959,660.70 = 618,692.20 : x
  2. Step 2: Convert to fraction form
    639,428.20/959,660.70 = 618,692.20/x
  3. Step 3: Cross multiply
    639,428.20x = 959,660.70 × 618,692.20
  4. Step 4: Simplify right side
    639,428.20x = 593,734,589,736.54
  5. Step 5: Solve for x
    x = 593,734,589,736.54/639,428.20
  6. Step 6: Final answer
    x = 928,539.89

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1.5x scale

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.