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Finding the Fourth Proportional to 206,435,772.80, 309,653,659.20 and 83,672,901.80

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Solution

The fourth proportional to 206,435,772.80, 309,653,659.20 and 83,672,901.80 is: 125,509,352.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,435,772.80 : 309,653,659.20 = 83,672,901.80 : x
  2. Step 2: Convert to fraction form
    206,435,772.80/309,653,659.20 = 83,672,901.80/x
  3. Step 3: Cross multiply
    206,435,772.80x = 309,653,659.20 × 83,672,901.80
  4. Step 4: Simplify right side
    206,435,772.80x = 25,909,620,218,252,264
  5. Step 5: Solve for x
    x = 25,909,620,218,252,264/206,435,772.80
  6. Step 6: Final answer
    x = 125,509,352.70

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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.