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Finding the Fourth Proportional to 1,181.39, 1,771.02 and 763.79

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Solution

The fourth proportional to 1,181.39, 1,771.02 and 763.79 is: 1,145.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.39 : 1,771.02 = 763.79 : x
  2. Step 2: Convert to fraction form
    1,181.39/1,771.02 = 763.79/x
  3. Step 3: Cross multiply
    1,181.39x = 1,771.02 × 763.79
  4. Step 4: Simplify right side
    1,181.39x = 1,352,687.37
  5. Step 5: Solve for x
    x = 1,352,687.37/1,181.39
  6. Step 6: Final answer
    x = 1,145.00

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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.