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Finding the Fourth Proportional to 719.44, 990.24 and 636.88

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Solution

The fourth proportional to 719.44, 990.24 and 636.88 is: 876.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.44 : 990.24 = 636.88 : x
  2. Step 2: Convert to fraction form
    719.44/990.24 = 636.88/x
  3. Step 3: Cross multiply
    719.44x = 990.24 × 636.88
  4. Step 4: Simplify right side
    719.44x = 630,664.05
  5. Step 5: Solve for x
    x = 630,664.05/719.44
  6. Step 6: Final answer
    x = 876.60

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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.