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Finding the Fourth Proportional to 83,990,713.20, 125,986,069.80 and 69,641,806.20

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Solution

The fourth proportional to 83,990,713.20, 125,986,069.80 and 69,641,806.20 is: 104,462,709.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,990,713.20 : 125,986,069.80 = 69,641,806.20 : x
  2. Step 2: Convert to fraction form
    83,990,713.20/125,986,069.80 = 69,641,806.20/x
  3. Step 3: Cross multiply
    83,990,713.20x = 125,986,069.80 × 69,641,806.20
  4. Step 4: Simplify right side
    83,990,713.20x = 8,773,897,456,911,273
  5. Step 5: Solve for x
    x = 8,773,897,456,911,273/83,990,713.20
  6. Step 6: Final answer
    x = 104,462,709.30

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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.