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Finding the Fourth Proportional to 55,279.80, 82,857.60 and 21,990.83

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Solution

The fourth proportional to 55,279.80, 82,857.60 and 21,990.83 is: 32,961.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,279.80 : 82,857.60 = 21,990.83 : x
  2. Step 2: Convert to fraction form
    55,279.80/82,857.60 = 21,990.83/x
  3. Step 3: Cross multiply
    55,279.80x = 82,857.60 × 21,990.83
  4. Step 4: Simplify right side
    55,279.80x = 1,822,106,981.52
  5. Step 5: Solve for x
    x = 1,822,106,981.52/55,279.80
  6. Step 6: Final answer
    x = 32,961.53

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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.