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Finding the Fourth Proportional to 419,906,539.80, 629,859,809.70 and 389,295,538.20

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Solution

The fourth proportional to 419,906,539.80, 629,859,809.70 and 389,295,538.20 is: 583,943,307.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,906,539.80 : 629,859,809.70 = 389,295,538.20 : x
  2. Step 2: Convert to fraction form
    419,906,539.80/629,859,809.70 = 389,295,538.20/x
  3. Step 3: Cross multiply
    419,906,539.80x = 629,859,809.70 × 389,295,538.20
  4. Step 4: Simplify right side
    419,906,539.80x = 245,201,613,607,711,104
  5. Step 5: Solve for x
    x = 245,201,613,607,711,104/419,906,539.80
  6. Step 6: Final answer
    x = 583,943,307.30

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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.