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Finding the Fourth Proportional to 3,278.05, 4,917.01 and 812.88

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Solution

The fourth proportional to 3,278.05, 4,917.01 and 812.88 is: 1,219.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,278.05 : 4,917.01 = 812.88 : x
  2. Step 2: Convert to fraction form
    3,278.05/4,917.01 = 812.88/x
  3. Step 3: Cross multiply
    3,278.05x = 4,917.01 × 812.88
  4. Step 4: Simplify right side
    3,278.05x = 3,996,939.09
  5. Step 5: Solve for x
    x = 3,996,939.09/3,278.05
  6. Step 6: Final answer
    x = 1,219.30

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1.5x scale

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.