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Finding the Fourth Proportional to 723.09, 1,085.64 and 449.52

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Solution

The fourth proportional to 723.09, 1,085.64 and 449.52 is: 674.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.09 : 1,085.64 = 449.52 : x
  2. Step 2: Convert to fraction form
    723.09/1,085.64 = 449.52/x
  3. Step 3: Cross multiply
    723.09x = 1,085.64 × 449.52
  4. Step 4: Simplify right side
    723.09x = 488,016.89
  5. Step 5: Solve for x
    x = 488,016.89/723.09
  6. Step 6: Final answer
    x = 674.90

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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.