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Finding the Fourth Proportional to 1,181.14, 1,629.22 and 782.80

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Solution

The fourth proportional to 1,181.14, 1,629.22 and 782.80 is: 1,079.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.14 : 1,629.22 = 782.80 : x
  2. Step 2: Convert to fraction form
    1,181.14/1,629.22 = 782.80/x
  3. Step 3: Cross multiply
    1,181.14x = 1,629.22 × 782.80
  4. Step 4: Simplify right side
    1,181.14x = 1,275,353.42
  5. Step 5: Solve for x
    x = 1,275,353.42/1,181.14
  6. Step 6: Final answer
    x = 1,079.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.