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Finding the Fourth Proportional to 81,093.45, 111,961.62 and 72,580.83

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Solution

The fourth proportional to 81,093.45, 111,961.62 and 72,580.83 is: 100,208.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,093.45 : 111,961.62 = 72,580.83 : x
  2. Step 2: Convert to fraction form
    81,093.45/111,961.62 = 72,580.83/x
  3. Step 3: Cross multiply
    81,093.45x = 111,961.62 × 72,580.83
  4. Step 4: Simplify right side
    81,093.45x = 8,126,267,307.74
  5. Step 5: Solve for x
    x = 8,126,267,307.74/81,093.45
  6. Step 6: Final answer
    x = 100,208.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.