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Finding the Fourth Proportional to 3,278.64, 4,918.05 and 813.42

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Solution

The fourth proportional to 3,278.64, 4,918.05 and 813.42 is: 1,220.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,278.64 : 4,918.05 = 813.42 : x
  2. Step 2: Convert to fraction form
    3,278.64/4,918.05 = 813.42/x
  3. Step 3: Cross multiply
    3,278.64x = 4,918.05 × 813.42
  4. Step 4: Simplify right side
    3,278.64x = 4,000,440.23
  5. Step 5: Solve for x
    x = 4,000,440.23/3,278.64
  6. Step 6: Final answer
    x = 1,220.15

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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.