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Finding the Fourth Proportional to 639,458.20, 959,705.70 and 618,722.20

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Solution

The fourth proportional to 639,458.20, 959,705.70 and 618,722.20 is: 928,584.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,458.20 : 959,705.70 = 618,722.20 : x
  2. Step 2: Convert to fraction form
    639,458.20/959,705.70 = 618,722.20/x
  3. Step 3: Cross multiply
    639,458.20x = 959,705.70 × 618,722.20
  4. Step 4: Simplify right side
    639,458.20x = 593,791,222,056.54
  5. Step 5: Solve for x
    x = 593,791,222,056.54/639,458.20
  6. Step 6: Final answer
    x = 928,584.89

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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.