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Finding the Fourth Proportional to 1,443.43, 2,165.21 and 518.95

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Solution

The fourth proportional to 1,443.43, 2,165.21 and 518.95 is: 778.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,443.43 : 2,165.21 = 518.95 : x
  2. Step 2: Convert to fraction form
    1,443.43/2,165.21 = 518.95/x
  3. Step 3: Cross multiply
    1,443.43x = 2,165.21 × 518.95
  4. Step 4: Simplify right side
    1,443.43x = 1,123,635.73
  5. Step 5: Solve for x
    x = 1,123,635.73/1,443.43
  6. Step 6: Final answer
    x = 778.45

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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.