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Finding the Fourth Proportional to 1,812, 2,717.70 and 513.18

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Solution

The fourth proportional to 1,812, 2,717.70 and 513.18 is: 769.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,812 : 2,717.70 = 513.18 : x
  2. Step 2: Convert to fraction form
    1,812/2,717.70 = 513.18/x
  3. Step 3: Cross multiply
    1,812x = 2,717.70 × 513.18
  4. Step 4: Simplify right side
    1,812x = 1,394,669.29
  5. Step 5: Solve for x
    x = 1,394,669.29/1,812
  6. Step 6: Final answer
    x = 769.69

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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.