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Finding the Fourth Proportional to 1,208.75, 1,813.43 and 515.60

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Solution

The fourth proportional to 1,208.75, 1,813.43 and 515.60 is: 773.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.75 : 1,813.43 = 515.60 : x
  2. Step 2: Convert to fraction form
    1,208.75/1,813.43 = 515.60/x
  3. Step 3: Cross multiply
    1,208.75x = 1,813.43 × 515.60
  4. Step 4: Simplify right side
    1,208.75x = 935,004.51
  5. Step 5: Solve for x
    x = 935,004.51/1,208.75
  6. Step 6: Final answer
    x = 773.53

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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.