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Finding the Fourth Proportional to 1,635.12, 2,453.49 and 813.38

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Solution

The fourth proportional to 1,635.12, 2,453.49 and 813.38 is: 1,220.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,635.12 : 2,453.49 = 813.38 : x
  2. Step 2: Convert to fraction form
    1,635.12/2,453.49 = 813.38/x
  3. Step 3: Cross multiply
    1,635.12x = 2,453.49 × 813.38
  4. Step 4: Simplify right side
    1,635.12x = 1,995,607.43
  5. Step 5: Solve for x
    x = 1,995,607.43/1,635.12
  6. Step 6: Final answer
    x = 1,220.47

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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.