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Finding the Fourth Proportional to 81,805.70, 122,708.55 and 72,620.30

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Solution

The fourth proportional to 81,805.70, 122,708.55 and 72,620.30 is: 108,930.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,805.70 : 122,708.55 = 72,620.30 : x
  2. Step 2: Convert to fraction form
    81,805.70/122,708.55 = 72,620.30/x
  3. Step 3: Cross multiply
    81,805.70x = 122,708.55 × 72,620.30
  4. Step 4: Simplify right side
    81,805.70x = 8,911,131,713.57
  5. Step 5: Solve for x
    x = 8,911,131,713.57/81,805.70
  6. Step 6: Final answer
    x = 108,930.45

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1.5x scale

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.