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Finding the Fourth Proportional to 83,209.20, 124,813.80 and 79,321.20

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Solution

The fourth proportional to 83,209.20, 124,813.80 and 79,321.20 is: 118,981.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,209.20 : 124,813.80 = 79,321.20 : x
  2. Step 2: Convert to fraction form
    83,209.20/124,813.80 = 79,321.20/x
  3. Step 3: Cross multiply
    83,209.20x = 124,813.80 × 79,321.20
  4. Step 4: Simplify right side
    83,209.20x = 9,900,380,392.56
  5. Step 5: Solve for x
    x = 9,900,380,392.56/83,209.20
  6. Step 6: Final answer
    x = 118,981.80

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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.