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Finding the Fourth Proportional to 639,738,623.80, 959,607,935.70 and 417,808,862.20

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Solution

The fourth proportional to 639,738,623.80, 959,607,935.70 and 417,808,862.20 is: 626,713,293.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,738,623.80 : 959,607,935.70 = 417,808,862.20 : x
  2. Step 2: Convert to fraction form
    639,738,623.80/959,607,935.70 = 417,808,862.20/x
  3. Step 3: Cross multiply
    639,738,623.80x = 959,607,935.70 × 417,808,862.20
  4. Step 4: Simplify right side
    639,738,623.80x = 400,932,699,772,907,776
  5. Step 5: Solve for x
    x = 400,932,699,772,907,776/639,738,623.80
  6. Step 6: Final answer
    x = 626,713,293.30

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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.