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Finding the Fourth Proportional to 791.28, 1,089.72 and 717.84

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Solution

The fourth proportional to 791.28, 1,089.72 and 717.84 is: 988.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.28 : 1,089.72 = 717.84 : x
  2. Step 2: Convert to fraction form
    791.28/1,089.72 = 717.84/x
  3. Step 3: Cross multiply
    791.28x = 1,089.72 × 717.84
  4. Step 4: Simplify right side
    791.28x = 782,244.60
  5. Step 5: Solve for x
    x = 782,244.60/791.28
  6. Step 6: Final answer
    x = 988.58

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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.