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Finding the Fourth Proportional to 1,813.62, 2,720.38 and 515.10

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Solution

The fourth proportional to 1,813.62, 2,720.38 and 515.10 is: 772.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,813.62 : 2,720.38 = 515.10 : x
  2. Step 2: Convert to fraction form
    1,813.62/2,720.38 = 515.10/x
  3. Step 3: Cross multiply
    1,813.62x = 2,720.38 × 515.10
  4. Step 4: Simplify right side
    1,813.62x = 1,401,267.74
  5. Step 5: Solve for x
    x = 1,401,267.74/1,813.62
  6. Step 6: Final answer
    x = 772.64

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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.