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Finding the Fourth Proportional to 719.72, 991.23 and 621.44

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Solution

The fourth proportional to 719.72, 991.23 and 621.44 is: 855.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.72 : 991.23 = 621.44 : x
  2. Step 2: Convert to fraction form
    719.72/991.23 = 621.44/x
  3. Step 3: Cross multiply
    719.72x = 991.23 × 621.44
  4. Step 4: Simplify right side
    719.72x = 615,989.97
  5. Step 5: Solve for x
    x = 615,989.97/719.72
  6. Step 6: Final answer
    x = 855.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.