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Finding the Fourth Proportional to 55,680, 83,518.36 and 20,618.88

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Solution

The fourth proportional to 55,680, 83,518.36 and 20,618.88 is: 30,927.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,680 : 83,518.36 = 20,618.88 : x
  2. Step 2: Convert to fraction form
    55,680/83,518.36 = 20,618.88/x
  3. Step 3: Cross multiply
    55,680x = 83,518.36 × 20,618.88
  4. Step 4: Simplify right side
    55,680x = 1,722,055,042.64
  5. Step 5: Solve for x
    x = 1,722,055,042.64/55,680
  6. Step 6: Final answer
    x = 30,927.71

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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.