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Finding the Fourth Proportional to 1,120.23, 1,679.31 and 755.15

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Solution

The fourth proportional to 1,120.23, 1,679.31 and 755.15 is: 1,132.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.23 : 1,679.31 = 755.15 : x
  2. Step 2: Convert to fraction form
    1,120.23/1,679.31 = 755.15/x
  3. Step 3: Cross multiply
    1,120.23x = 1,679.31 × 755.15
  4. Step 4: Simplify right side
    1,120.23x = 1,268,122.55
  5. Step 5: Solve for x
    x = 1,268,122.55/1,120.23
  6. Step 6: Final answer
    x = 1,132.02

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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.