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Finding the Fourth Proportional to 639,738,612.80, 959,607,919.20 and 417,808,851.20

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Solution

The fourth proportional to 639,738,612.80, 959,607,919.20 and 417,808,851.20 is: 626,713,276.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,738,612.80 : 959,607,919.20 = 417,808,851.20 : x
  2. Step 2: Convert to fraction form
    639,738,612.80/959,607,919.20 = 417,808,851.20/x
  3. Step 3: Cross multiply
    639,738,612.80x = 959,607,919.20 × 417,808,851.20
  4. Step 4: Simplify right side
    639,738,612.80x = 400,932,682,323,374,400
  5. Step 5: Solve for x
    x = 400,932,682,323,374,400/639,738,612.80
  6. Step 6: Final answer
    x = 626,713,276.80

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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.