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Finding the Fourth Proportional to 722.87, 1,085 and 449.50

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Solution

The fourth proportional to 722.87, 1,085 and 449.50 is: 674.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.87 : 1,085 = 449.50 : x
  2. Step 2: Convert to fraction form
    722.87/1,085 = 449.50/x
  3. Step 3: Cross multiply
    722.87x = 1,085 × 449.50
  4. Step 4: Simplify right side
    722.87x = 487,707.50
  5. Step 5: Solve for x
    x = 487,707.50/722.87
  6. Step 6: Final answer
    x = 674.68

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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.