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Finding the Fourth Proportional to 722.70, 1,081.22 and 661.41

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Solution

The fourth proportional to 722.70, 1,081.22 and 661.41 is: 989.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.70 : 1,081.22 = 661.41 : x
  2. Step 2: Convert to fraction form
    722.70/1,081.22 = 661.41/x
  3. Step 3: Cross multiply
    722.70x = 1,081.22 × 661.41
  4. Step 4: Simplify right side
    722.70x = 715,126.41
  5. Step 5: Solve for x
    x = 715,126.41/722.70
  6. Step 6: Final answer
    x = 989.52

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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.