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Finding the Fourth Proportional to 1,181.26, 1,778.81 and 875.28

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Solution

The fourth proportional to 1,181.26, 1,778.81 and 875.28 is: 1,318.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.26 : 1,778.81 = 875.28 : x
  2. Step 2: Convert to fraction form
    1,181.26/1,778.81 = 875.28/x
  3. Step 3: Cross multiply
    1,181.26x = 1,778.81 × 875.28
  4. Step 4: Simplify right side
    1,181.26x = 1,556,959.08
  5. Step 5: Solve for x
    x = 1,556,959.08/1,181.26
  6. Step 6: Final answer
    x = 1,318.05

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.