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Finding the Fourth Proportional to 1,812.39, 2,718.60 and 513.87

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Solution

The fourth proportional to 1,812.39, 2,718.60 and 513.87 is: 770.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,812.39 : 2,718.60 = 513.87 : x
  2. Step 2: Convert to fraction form
    1,812.39/2,718.60 = 513.87/x
  3. Step 3: Cross multiply
    1,812.39x = 2,718.60 × 513.87
  4. Step 4: Simplify right side
    1,812.39x = 1,397,006.98
  5. Step 5: Solve for x
    x = 1,397,006.98/1,812.39
  6. Step 6: Final answer
    x = 770.81

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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.