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Finding the Fourth Proportional to 722.45, 991.13 and 687.60

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Solution

The fourth proportional to 722.45, 991.13 and 687.60 is: 943.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.45 : 991.13 = 687.60 : x
  2. Step 2: Convert to fraction form
    722.45/991.13 = 687.60/x
  3. Step 3: Cross multiply
    722.45x = 991.13 × 687.60
  4. Step 4: Simplify right side
    722.45x = 681,497.55
  5. Step 5: Solve for x
    x = 681,497.55/722.45
  6. Step 6: Final answer
    x = 943.31

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.