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Finding the Fourth Proportional to 1,780.38, 2,670.78 and 481.86

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Solution

The fourth proportional to 1,780.38, 2,670.78 and 481.86 is: 722.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.38 : 2,670.78 = 481.86 : x
  2. Step 2: Convert to fraction form
    1,780.38/2,670.78 = 481.86/x
  3. Step 3: Cross multiply
    1,780.38x = 2,670.78 × 481.86
  4. Step 4: Simplify right side
    1,780.38x = 1,286,942.05
  5. Step 5: Solve for x
    x = 1,286,942.05/1,780.38
  6. Step 6: Final answer
    x = 722.85

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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.