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Finding the Fourth Proportional to 1,208.80, 1,812.74 and 515.03

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Solution

The fourth proportional to 1,208.80, 1,812.74 and 515.03 is: 772.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.80 : 1,812.74 = 515.03 : x
  2. Step 2: Convert to fraction form
    1,208.80/1,812.74 = 515.03/x
  3. Step 3: Cross multiply
    1,208.80x = 1,812.74 × 515.03
  4. Step 4: Simplify right side
    1,208.80x = 933,615.48
  5. Step 5: Solve for x
    x = 933,615.48/1,208.80
  6. Step 6: Final answer
    x = 772.35

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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.