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Finding the Fourth Proportional to 81,855.81, 112,990.88 and 51,660.83

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Solution

The fourth proportional to 81,855.81, 112,990.88 and 51,660.83 is: 71,310.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,855.81 : 112,990.88 = 51,660.83 : x
  2. Step 2: Convert to fraction form
    81,855.81/112,990.88 = 51,660.83/x
  3. Step 3: Cross multiply
    81,855.81x = 112,990.88 × 51,660.83
  4. Step 4: Simplify right side
    81,855.81x = 5,837,203,054.86
  5. Step 5: Solve for x
    x = 5,837,203,054.86/81,855.81
  6. Step 6: Final answer
    x = 71,310.80

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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.