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Finding the Fourth Proportional to 639,373.20, 959,578.20 and 618,637.20

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Solution

The fourth proportional to 639,373.20, 959,578.20 and 618,637.20 is: 928,457.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,373.20 : 959,578.20 = 618,637.20 : x
  2. Step 2: Convert to fraction form
    639,373.20/959,578.20 = 618,637.20/x
  3. Step 3: Cross multiply
    639,373.20x = 959,578.20 × 618,637.20
  4. Step 4: Simplify right side
    639,373.20x = 593,630,770,829.04
  5. Step 5: Solve for x
    x = 593,630,770,829.04/639,373.20
  6. Step 6: Final answer
    x = 928,457.39

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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.