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Finding the Fourth Proportional to 718.89, 988.92 and 629.97

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Solution

The fourth proportional to 718.89, 988.92 and 629.97 is: 866.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.89 : 988.92 = 629.97 : x
  2. Step 2: Convert to fraction form
    718.89/988.92 = 629.97/x
  3. Step 3: Cross multiply
    718.89x = 988.92 × 629.97
  4. Step 4: Simplify right side
    718.89x = 622,989.93
  5. Step 5: Solve for x
    x = 622,989.93/718.89
  6. Step 6: Final answer
    x = 866.60

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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.