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Finding the Fourth Proportional to 639,428.70, 959,661.45 and 618,692.70

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Solution

The fourth proportional to 639,428.70, 959,661.45 and 618,692.70 is: 928,540.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,428.70 : 959,661.45 = 618,692.70 : x
  2. Step 2: Convert to fraction form
    639,428.70/959,661.45 = 618,692.70/x
  3. Step 3: Cross multiply
    639,428.70x = 959,661.45 × 618,692.70
  4. Step 4: Simplify right side
    639,428.70x = 593,735,533,586.42
  5. Step 5: Solve for x
    x = 593,735,533,586.42/639,428.70
  6. Step 6: Final answer
    x = 928,540.64

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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.