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Finding the Fourth Proportional to 1,813.74, 2,720.60 and 515.21

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Solution

The fourth proportional to 1,813.74, 2,720.60 and 515.21 is: 772.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,813.74 : 2,720.60 = 515.21 : x
  2. Step 2: Convert to fraction form
    1,813.74/2,720.60 = 515.21/x
  3. Step 3: Cross multiply
    1,813.74x = 2,720.60 × 515.21
  4. Step 4: Simplify right side
    1,813.74x = 1,401,664.15
  5. Step 5: Solve for x
    x = 1,401,664.15/1,813.74
  6. Step 6: Final answer
    x = 772.80

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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.