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Finding the Fourth Proportional to 1,813.63, 2,720.38 and 515.11

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Solution

The fourth proportional to 1,813.63, 2,720.38 and 515.11 is: 772.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,813.63 : 2,720.38 = 515.11 : x
  2. Step 2: Convert to fraction form
    1,813.63/2,720.38 = 515.11/x
  3. Step 3: Cross multiply
    1,813.63x = 2,720.38 × 515.11
  4. Step 4: Simplify right side
    1,813.63x = 1,401,294.94
  5. Step 5: Solve for x
    x = 1,401,294.94/1,813.63
  6. Step 6: Final answer
    x = 772.65

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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.