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Finding the Fourth Proportional to 1,181.20, 1,778.67 and 875.22

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Solution

The fourth proportional to 1,181.20, 1,778.67 and 875.22 is: 1,317.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.20 : 1,778.67 = 875.22 : x
  2. Step 2: Convert to fraction form
    1,181.20/1,778.67 = 875.22/x
  3. Step 3: Cross multiply
    1,181.20x = 1,778.67 × 875.22
  4. Step 4: Simplify right side
    1,181.20x = 1,556,727.56
  5. Step 5: Solve for x
    x = 1,556,727.56/1,181.20
  6. Step 6: Final answer
    x = 1,317.92

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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.