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Finding the Fourth Proportional to 791.61, 1,089.95 and 673.35

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Solution

The fourth proportional to 791.61, 1,089.95 and 673.35 is: 927.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.61 : 1,089.95 = 673.35 : x
  2. Step 2: Convert to fraction form
    791.61/1,089.95 = 673.35/x
  3. Step 3: Cross multiply
    791.61x = 1,089.95 × 673.35
  4. Step 4: Simplify right side
    791.61x = 733,914.47
  5. Step 5: Solve for x
    x = 733,914.47/791.61
  6. Step 6: Final answer
    x = 927.12

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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.