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Finding the Fourth Proportional to 1,208.05, 1,811.13 and 514.83

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Solution

The fourth proportional to 1,208.05, 1,811.13 and 514.83 is: 771.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.05 : 1,811.13 = 514.83 : x
  2. Step 2: Convert to fraction form
    1,208.05/1,811.13 = 514.83/x
  3. Step 3: Cross multiply
    1,208.05x = 1,811.13 × 514.83
  4. Step 4: Simplify right side
    1,208.05x = 932,424.06
  5. Step 5: Solve for x
    x = 932,424.06/1,208.05
  6. Step 6: Final answer
    x = 771.84

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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.