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Finding the Fourth Proportional to 671,976,759.80, 1,007,965,139.70 and 211,961,430.20

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Solution

The fourth proportional to 671,976,759.80, 1,007,965,139.70 and 211,961,430.20 is: 317,942,145.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    671,976,759.80 : 1,007,965,139.70 = 211,961,430.20 : x
  2. Step 2: Convert to fraction form
    671,976,759.80/1,007,965,139.70 = 211,961,430.20/x
  3. Step 3: Cross multiply
    671,976,759.80x = 1,007,965,139.70 × 211,961,430.20
  4. Step 4: Simplify right side
    671,976,759.80x = 213,649,732,602,554,784
  5. Step 5: Solve for x
    x = 213,649,732,602,554,784/671,976,759.80
  6. Step 6: Final answer
    x = 317,942,145.30

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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.