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Finding the Fourth Proportional to 1,813.98, 2,720.96 and 515.40

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Solution

The fourth proportional to 1,813.98, 2,720.96 and 515.40 is: 773.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,813.98 : 2,720.96 = 515.40 : x
  2. Step 2: Convert to fraction form
    1,813.98/2,720.96 = 515.40/x
  3. Step 3: Cross multiply
    1,813.98x = 2,720.96 × 515.40
  4. Step 4: Simplify right side
    1,813.98x = 1,402,382.78
  5. Step 5: Solve for x
    x = 1,402,382.78/1,813.98
  6. Step 6: Final answer
    x = 773.10

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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.