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Finding the Fourth Proportional to 1,209.15, 1,813.92 and 515.83

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Solution

The fourth proportional to 1,209.15, 1,813.92 and 515.83 is: 773.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.15 : 1,813.92 = 515.83 : x
  2. Step 2: Convert to fraction form
    1,209.15/1,813.92 = 515.83/x
  3. Step 3: Cross multiply
    1,209.15x = 1,813.92 × 515.83
  4. Step 4: Simplify right side
    1,209.15x = 935,662.70
  5. Step 5: Solve for x
    x = 935,662.70/1,209.15
  6. Step 6: Final answer
    x = 773.82

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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.