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Finding the Fourth Proportional to 1,818.86, 2,728.10 and 520.44

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Solution

The fourth proportional to 1,818.86, 2,728.10 and 520.44 is: 780.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,818.86 : 2,728.10 = 520.44 : x
  2. Step 2: Convert to fraction form
    1,818.86/2,728.10 = 520.44/x
  3. Step 3: Cross multiply
    1,818.86x = 2,728.10 × 520.44
  4. Step 4: Simplify right side
    1,818.86x = 1,419,812.36
  5. Step 5: Solve for x
    x = 1,419,812.36/1,818.86
  6. Step 6: Final answer
    x = 780.61

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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.