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Finding the Fourth Proportional to 753.23, 1,131.12 and 720.83

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Solution

The fourth proportional to 753.23, 1,131.12 and 720.83 is: 1,082.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.23 : 1,131.12 = 720.83 : x
  2. Step 2: Convert to fraction form
    753.23/1,131.12 = 720.83/x
  3. Step 3: Cross multiply
    753.23x = 1,131.12 × 720.83
  4. Step 4: Simplify right side
    753.23x = 815,339.57
  5. Step 5: Solve for x
    x = 815,339.57/753.23
  6. Step 6: Final answer
    x = 1,082.46

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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.