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Finding the Fourth Proportional to 722.39, 1,081.70 and 662.24

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Solution

The fourth proportional to 722.39, 1,081.70 and 662.24 is: 991.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.39 : 1,081.70 = 662.24 : x
  2. Step 2: Convert to fraction form
    722.39/1,081.70 = 662.24/x
  3. Step 3: Cross multiply
    722.39x = 1,081.70 × 662.24
  4. Step 4: Simplify right side
    722.39x = 716,336.29
  5. Step 5: Solve for x
    x = 716,336.29/722.39
  6. Step 6: Final answer
    x = 991.63

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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.